20538520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{11941}}^1$

素因数の和:11995

約数の個数: 32

約数和(自身を含む): 47290320

約数和(自身を除く): 26751800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 11941, 23882, 47764, 59705, 95528, 119410, 238820, 477640, 513463, 1026926, 2053852, 2567315, 4107704, 5134630, 10269260, 20538520]

約数ペア:

[(1, 20538520), (2, 10269260), (4, 5134630), (5, 4107704), (8, 2567315), (10, 2053852), (20, 1026926), (40, 513463), (43, 477640), (86, 238820), (172, 119410), (215, 95528), (344, 59705), (430, 47764), (860, 23882), (1720, 11941)]