21720420

素因数分解:

$2^2\times 3^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1$

素因数の和:139

約数の個数: 192

約数和(自身を含む): 74592000

約数和(自身を除く): 52871580

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 27, 29, 30, 36, 38, 45, 54, 57, 58, 60, 73, 76, 87, 90, 95, 108, 114, 116, 135, 145, 146, 171, 174, 180, 190, 219, 228, 261, 270, 285, 290, 292, 342, 348, 365, 380, 435, 438, 513, 522, 540, 551, 570, 580, 657, 684, 730, 783, 855, 870, 876, 1026, 1044, 1095, 1102, 1140, 1305, 1314, 1387, 1460, 1566, 1653, 1710, 1740, 1971, 2052, 2117, 2190, 2204, 2565, 2610, 2628, 2755, 2774, 3132, 3285, 3306, 3420, 3915, 3942, 4161, 4234, 4380, 4959, 5130, 5220, 5510, 5548, 6351, 6570, 6612, 6935, 7830, 7884, 8265, 8322, 8468, 9855, 9918, 10260, 10585, 11020, 12483, 12702, 13140, 13870, 14877, 15660, 16530, 16644, 19053, 19710, 19836, 20805, 21170, 24795, 24966, 25404, 27740, 29754, 31755, 33060, 37449, 38106, 39420, 40223, 41610, 42340, 49590, 49932, 57159, 59508, 62415, 63510, 74385, 74898, 76212, 80446, 83220, 95265, 99180, 114318, 120669, 124830, 127020, 148770, 149796, 160892, 187245, 190530, 201115, 228636, 241338, 249660, 285795, 297540, 362007, 374490, 381060, 402230, 482676, 571590, 603345, 724014, 748980, 804460, 1086021, 1143180, 1206690, 1448028, 1810035, 2172042, 2413380, 3620070, 4344084, 5430105, 7240140, 10860210, 21720420]

約数ペア:

[(1, 21720420), (2, 10860210), (3, 7240140), (4, 5430105), (5, 4344084), (6, 3620070), (9, 2413380), (10, 2172042), (12, 1810035), (15, 1448028), (18, 1206690), (19, 1143180), (20, 1086021), (27, 804460), (29, 748980), (30, 724014), (36, 603345), (38, 571590), (45, 482676), (54, 402230), (57, 381060), (58, 374490), (60, 362007), (73, 297540), (76, 285795), (87, 249660), (90, 241338), (95, 228636), (108, 201115), (114, 190530), (116, 187245), (135, 160892), (145, 149796), (146, 148770), (171, 127020), (174, 124830), (180, 120669), (190, 114318), (219, 99180), (228, 95265), (261, 83220), (270, 80446), (285, 76212), (290, 74898), (292, 74385), (342, 63510), (348, 62415), (365, 59508), (380, 57159), (435, 49932), (438, 49590), (513, 42340), (522, 41610), (540, 40223), (551, 39420), (570, 38106), (580, 37449), (657, 33060), (684, 31755), (730, 29754), (783, 27740), (855, 25404), (870, 24966), (876, 24795), (1026, 21170), (1044, 20805), (1095, 19836), (1102, 19710), (1140, 19053), (1305, 16644), (1314, 16530), (1387, 15660), (1460, 14877), (1566, 13870), (1653, 13140), (1710, 12702), (1740, 12483), (1971, 11020), (2052, 10585), (2117, 10260), (2190, 9918), (2204, 9855), (2565, 8468), (2610, 8322), (2628, 8265), (2755, 7884), (2774, 7830), (3132, 6935), (3285, 6612), (3306, 6570), (3420, 6351), (3915, 5548), (3942, 5510), (4161, 5220), (4234, 5130), (4380, 4959)]