21077980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13687}}^1$

素因数の和:13714

約数の個数: 48

約数和(自身を含む): 55190016

約数和(自身を除く): 34112036

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 13687, 27374, 54748, 68435, 95809, 136870, 150557, 191618, 273740, 301114, 383236, 479045, 602228, 752785, 958090, 1053899, 1505570, 1916180, 2107798, 3011140, 4215596, 5269495, 10538990, 21077980]

約数ペア:

[(1, 21077980), (2, 10538990), (4, 5269495), (5, 4215596), (7, 3011140), (10, 2107798), (11, 1916180), (14, 1505570), (20, 1053899), (22, 958090), (28, 752785), (35, 602228), (44, 479045), (55, 383236), (70, 301114), (77, 273740), (110, 191618), (140, 150557), (154, 136870), (220, 95809), (308, 68435), (385, 54748), (770, 27374), (1540, 13687)]