21906680

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{2131}}^1$

素因数の和:2399

約数の個数: 32

約数和(自身を含む): 49505040

約数和(自身を除く): 27598360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2131, 2570, 4262, 5140, 8524, 10280, 10655, 17048, 21310, 42620, 85240, 547667, 1095334, 2190668, 2738335, 4381336, 5476670, 10953340, 21906680]

約数ペア:

[(1, 21906680), (2, 10953340), (4, 5476670), (5, 4381336), (8, 2738335), (10, 2190668), (20, 1095334), (40, 547667), (257, 85240), (514, 42620), (1028, 21310), (1285, 17048), (2056, 10655), (2131, 10280), (2570, 8524), (4262, 5140)]