15678220

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:322

約数の個数: 48

約数和(自身を含む): 34122816

約数和(自身を除く): 18444596

約数列:

[1, 2, 4, 5, 10, 20, 61, 71, 122, 142, 181, 244, 284, 305, 355, 362, 610, 710, 724, 905, 1220, 1420, 1810, 3620, 4331, 8662, 11041, 12851, 17324, 21655, 22082, 25702, 43310, 44164, 51404, 55205, 64255, 86620, 110410, 128510, 220820, 257020, 783911, 1567822, 3135644, 3919555, 7839110, 15678220]

約数ペア:

[(1, 15678220), (2, 7839110), (4, 3919555), (5, 3135644), (10, 1567822), (20, 783911), (61, 257020), (71, 220820), (122, 128510), (142, 110410), (181, 86620), (244, 64255), (284, 55205), (305, 51404), (355, 44164), (362, 43310), (610, 25702), (710, 22082), (724, 21655), (905, 17324), (1220, 12851), (1420, 11041), (1810, 8662), (3620, 4331)]