21988120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^3\times {\mathrm{59}}^1$

素因数の和:110

約数の個数: 128

約数和(自身を含む): 63244800

約数和(自身を除く): 41256680

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 40, 44, 55, 56, 59, 70, 77, 88, 110, 118, 121, 140, 154, 220, 236, 242, 280, 295, 308, 385, 413, 440, 472, 484, 590, 605, 616, 649, 770, 826, 847, 968, 1180, 1210, 1298, 1331, 1540, 1652, 1694, 2065, 2360, 2420, 2596, 2662, 3080, 3245, 3304, 3388, 4130, 4235, 4543, 4840, 5192, 5324, 6490, 6655, 6776, 7139, 8260, 8470, 9086, 9317, 10648, 12980, 13310, 14278, 16520, 16940, 18172, 18634, 22715, 25960, 26620, 28556, 33880, 35695, 36344, 37268, 45430, 46585, 49973, 53240, 57112, 71390, 74536, 78529, 90860, 93170, 99946, 142780, 157058, 181720, 186340, 199892, 249865, 285560, 314116, 372680, 392645, 399784, 499730, 549703, 628232, 785290, 999460, 1099406, 1570580, 1998920, 2198812, 2748515, 3141160, 4397624, 5497030, 10994060, 21988120]

約数ペア:

[(1, 21988120), (2, 10994060), (4, 5497030), (5, 4397624), (7, 3141160), (8, 2748515), (10, 2198812), (11, 1998920), (14, 1570580), (20, 1099406), (22, 999460), (28, 785290), (35, 628232), (40, 549703), (44, 499730), (55, 399784), (56, 392645), (59, 372680), (70, 314116), (77, 285560), (88, 249865), (110, 199892), (118, 186340), (121, 181720), (140, 157058), (154, 142780), (220, 99946), (236, 93170), (242, 90860), (280, 78529), (295, 74536), (308, 71390), (385, 57112), (413, 53240), (440, 49973), (472, 46585), (484, 45430), (590, 37268), (605, 36344), (616, 35695), (649, 33880), (770, 28556), (826, 26620), (847, 25960), (968, 22715), (1180, 18634), (1210, 18172), (1298, 16940), (1331, 16520), (1540, 14278), (1652, 13310), (1694, 12980), (2065, 10648), (2360, 9317), (2420, 9086), (2596, 8470), (2662, 8260), (3080, 7139), (3245, 6776), (3304, 6655), (3388, 6490), (4130, 5324), (4235, 5192), (4543, 4840)]