20813720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12101}}^1$

素因数の和:12155

約数の個数: 32

約数和(自身を含む): 47923920

約数和(自身を除く): 27110200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12101, 24202, 48404, 60505, 96808, 121010, 242020, 484040, 520343, 1040686, 2081372, 2601715, 4162744, 5203430, 10406860, 20813720]

約数ペア:

[(1, 20813720), (2, 10406860), (4, 5203430), (5, 4162744), (8, 2601715), (10, 2081372), (20, 1040686), (40, 520343), (43, 484040), (86, 242020), (172, 121010), (215, 96808), (344, 60505), (430, 48404), (860, 24202), (1720, 12101)]