20281640

素因数分解:

$2^3\times 5^1\times {\mathrm{271}}^1\times {\mathrm{1871}}^1$

素因数の和:2153

約数の個数: 32

約数和(自身を含む): 45826560

約数和(自身を除く): 25544920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 271, 542, 1084, 1355, 1871, 2168, 2710, 3742, 5420, 7484, 9355, 10840, 14968, 18710, 37420, 74840, 507041, 1014082, 2028164, 2535205, 4056328, 5070410, 10140820, 20281640]

約数ペア:

[(1, 20281640), (2, 10140820), (4, 5070410), (5, 4056328), (8, 2535205), (10, 2028164), (20, 1014082), (40, 507041), (271, 74840), (542, 37420), (1084, 18710), (1355, 14968), (1871, 10840), (2168, 9355), (2710, 7484), (3742, 5420)]