21131440

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{59}}^1$

素因数の和:131

約数の個数: 120

約数和(自身を含む): 56402640

約数和(自身を除く): 35271200

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 37, 40, 44, 55, 59, 74, 80, 88, 110, 118, 121, 148, 176, 185, 220, 236, 242, 295, 296, 370, 407, 440, 472, 484, 590, 592, 605, 649, 740, 814, 880, 944, 968, 1180, 1210, 1298, 1480, 1628, 1936, 2035, 2183, 2360, 2420, 2596, 2960, 3245, 3256, 4070, 4366, 4477, 4720, 4840, 5192, 6490, 6512, 7139, 8140, 8732, 8954, 9680, 10384, 10915, 12980, 14278, 16280, 17464, 17908, 21830, 22385, 24013, 25960, 28556, 32560, 34928, 35695, 35816, 43660, 44770, 48026, 51920, 57112, 71390, 71632, 87320, 89540, 96052, 114224, 120065, 142780, 174640, 179080, 192104, 240130, 264143, 285560, 358160, 384208, 480260, 528286, 571120, 960520, 1056572, 1320715, 1921040, 2113144, 2641430, 4226288, 5282860, 10565720, 21131440]

約数ペア:

[(1, 21131440), (2, 10565720), (4, 5282860), (5, 4226288), (8, 2641430), (10, 2113144), (11, 1921040), (16, 1320715), (20, 1056572), (22, 960520), (37, 571120), (40, 528286), (44, 480260), (55, 384208), (59, 358160), (74, 285560), (80, 264143), (88, 240130), (110, 192104), (118, 179080), (121, 174640), (148, 142780), (176, 120065), (185, 114224), (220, 96052), (236, 89540), (242, 87320), (295, 71632), (296, 71390), (370, 57112), (407, 51920), (440, 48026), (472, 44770), (484, 43660), (590, 35816), (592, 35695), (605, 34928), (649, 32560), (740, 28556), (814, 25960), (880, 24013), (944, 22385), (968, 21830), (1180, 17908), (1210, 17464), (1298, 16280), (1480, 14278), (1628, 12980), (1936, 10915), (2035, 10384), (2183, 9680), (2360, 8954), (2420, 8732), (2596, 8140), (2960, 7139), (3245, 6512), (3256, 6490), (4070, 5192), (4366, 4840), (4477, 4720)]