20702180

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1$

素因数の和:380

約数の個数: 48

約数和(自身を含む): 44997120

約数和(自身を除く): 24294940

約数列:

[1, 2, 4, 5, 10, 20, 61, 71, 122, 142, 239, 244, 284, 305, 355, 478, 610, 710, 956, 1195, 1220, 1420, 2390, 4331, 4780, 8662, 14579, 16969, 17324, 21655, 29158, 33938, 43310, 58316, 67876, 72895, 84845, 86620, 145790, 169690, 291580, 339380, 1035109, 2070218, 4140436, 5175545, 10351090, 20702180]

約数ペア:

[(1, 20702180), (2, 10351090), (4, 5175545), (5, 4140436), (10, 2070218), (20, 1035109), (61, 339380), (71, 291580), (122, 169690), (142, 145790), (239, 86620), (244, 84845), (284, 72895), (305, 67876), (355, 58316), (478, 43310), (610, 33938), (710, 29158), (956, 21655), (1195, 17324), (1220, 16969), (1420, 14579), (2390, 8662), (4331, 4780)]