64991380

素因数分解:

$2^2\times 5^1\times {\mathrm{1289}}^1\times {\mathrm{2521}}^1$

素因数の和:3819

約数の個数: 24

約数和(自身を含む): 136641960

約数和(自身を除く): 71650580

約数列:

[1, 2, 4, 5, 10, 20, 1289, 2521, 2578, 5042, 5156, 6445, 10084, 12605, 12890, 25210, 25780, 50420, 3249569, 6499138, 12998276, 16247845, 32495690, 64991380]

約数ペア:

[(1, 64991380), (2, 32495690), (4, 16247845), (5, 12998276), (10, 6499138), (20, 3249569), (1289, 50420), (2521, 25780), (2578, 25210), (5042, 12890), (5156, 12605), (6445, 10084)]