639220

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1031}}^1$

素因数の和:1071

約数の個数: 24

約数和(自身を含む): 1387008

約数和(自身を除く): 747788

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 1031, 2062, 4124, 5155, 10310, 20620, 31961, 63922, 127844, 159805, 319610, 639220]

約数ペア:

[(1, 639220), (2, 319610), (4, 159805), (5, 127844), (10, 63922), (20, 31961), (31, 20620), (62, 10310), (124, 5155), (155, 4124), (310, 2062), (620, 1031)]