21664840

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4969}}^1$

素因数の和:5089

約数の個数: 32

約数和(自身を含む): 49203000

約数和(自身を除く): 27538160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4969, 9938, 19876, 24845, 39752, 49690, 99380, 198760, 541621, 1083242, 2166484, 2708105, 4332968, 5416210, 10832420, 21664840]

約数ペア:

[(1, 21664840), (2, 10832420), (4, 5416210), (5, 4332968), (8, 2708105), (10, 2166484), (20, 1083242), (40, 541621), (109, 198760), (218, 99380), (436, 49690), (545, 39752), (872, 24845), (1090, 19876), (2180, 9938), (4360, 4969)]