639692

素因数分解:

$2^2\times {\mathrm{19}}^2\times {\mathrm{443}}^1$

素因数の和:485

約数の個数: 18

約数和(自身を含む): 1184148

約数和(自身を除く): 544456

約数列:

[1, 2, 4, 19, 38, 76, 361, 443, 722, 886, 1444, 1772, 8417, 16834, 33668, 159923, 319846, 639692]

約数ペア:

[(1, 639692), (2, 319846), (4, 159923), (19, 33668), (38, 16834), (76, 8417), (361, 1772), (443, 1444), (722, 886)]