639891505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{383}}^1\times {\mathrm{821}}^1$

素因数の和:1257

約数の個数: 32

約数和(自身を含む): 863612928

約数和(自身を除く): 223721423

約数列:

[1, 5, 11, 37, 55, 185, 383, 407, 821, 1915, 2035, 4105, 4213, 9031, 14171, 21065, 30377, 45155, 70855, 151885, 155881, 314443, 334147, 779405, 1572215, 1670735, 3458873, 11634391, 17294365, 58171955, 127978301, 639891505]

約数ペア:

[(1, 639891505), (5, 127978301), (11, 58171955), (37, 17294365), (55, 11634391), (185, 3458873), (383, 1670735), (407, 1572215), (821, 779405), (1915, 334147), (2035, 314443), (4105, 155881), (4213, 151885), (9031, 70855), (14171, 45155), (21065, 30377)]