400996840

素因数分解:

$2^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{63853}}^1$

素因数の和:64021

約数の個数: 32

約数和(自身を含む): 908003880

約数和(自身を除く): 507007040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 157, 314, 628, 785, 1256, 1570, 3140, 6280, 63853, 127706, 255412, 319265, 510824, 638530, 1277060, 2554120, 10024921, 20049842, 40099684, 50124605, 80199368, 100249210, 200498420, 400996840]

約数ペア:

[(1, 400996840), (2, 200498420), (4, 100249210), (5, 80199368), (8, 50124605), (10, 40099684), (20, 20049842), (40, 10024921), (157, 2554120), (314, 1277060), (628, 638530), (785, 510824), (1256, 319265), (1570, 255412), (3140, 127706), (6280, 63853)]