20691880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1$

素因数の和:131

約数の個数: 128

約数和(自身を含む): 55157760

約数和(自身を除く): 34465880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 31, 37, 40, 41, 44, 55, 62, 74, 82, 88, 110, 124, 148, 155, 164, 185, 205, 220, 248, 296, 310, 328, 341, 370, 407, 410, 440, 451, 620, 682, 740, 814, 820, 902, 1147, 1240, 1271, 1364, 1480, 1517, 1628, 1640, 1705, 1804, 2035, 2255, 2294, 2542, 2728, 3034, 3256, 3410, 3608, 4070, 4510, 4588, 5084, 5735, 6068, 6355, 6820, 7585, 8140, 9020, 9176, 10168, 11470, 12136, 12617, 12710, 13640, 13981, 15170, 16280, 16687, 18040, 22940, 25234, 25420, 27962, 30340, 33374, 45880, 47027, 50468, 50840, 55924, 60680, 63085, 66748, 69905, 83435, 94054, 100936, 111848, 126170, 133496, 139810, 166870, 188108, 235135, 252340, 279620, 333740, 376216, 470270, 504680, 517297, 559240, 667480, 940540, 1034594, 1881080, 2069188, 2586485, 4138376, 5172970, 10345940, 20691880]

約数ペア:

[(1, 20691880), (2, 10345940), (4, 5172970), (5, 4138376), (8, 2586485), (10, 2069188), (11, 1881080), (20, 1034594), (22, 940540), (31, 667480), (37, 559240), (40, 517297), (41, 504680), (44, 470270), (55, 376216), (62, 333740), (74, 279620), (82, 252340), (88, 235135), (110, 188108), (124, 166870), (148, 139810), (155, 133496), (164, 126170), (185, 111848), (205, 100936), (220, 94054), (248, 83435), (296, 69905), (310, 66748), (328, 63085), (341, 60680), (370, 55924), (407, 50840), (410, 50468), (440, 47027), (451, 45880), (620, 33374), (682, 30340), (740, 27962), (814, 25420), (820, 25234), (902, 22940), (1147, 18040), (1240, 16687), (1271, 16280), (1364, 15170), (1480, 13981), (1517, 13640), (1628, 12710), (1640, 12617), (1705, 12136), (1804, 11470), (2035, 10168), (2255, 9176), (2294, 9020), (2542, 8140), (2728, 7585), (3034, 6820), (3256, 6355), (3410, 6068), (3608, 5735), (4070, 5084), (4510, 4588)]