21529240

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12517}}^1$

素因数の和:12571

約数の個数: 32

約数和(自身を含む): 49571280

約数和(自身を除く): 28042040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12517, 25034, 50068, 62585, 100136, 125170, 250340, 500680, 538231, 1076462, 2152924, 2691155, 4305848, 5382310, 10764620, 21529240]

約数ペア:

[(1, 21529240), (2, 10764620), (4, 5382310), (5, 4305848), (8, 2691155), (10, 2152924), (20, 1076462), (40, 538231), (43, 500680), (86, 250340), (172, 125170), (215, 100136), (344, 62585), (430, 50068), (860, 25034), (1720, 12517)]