20513980

素因数分解:

$2^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{2089}}^1$

素因数の和:2589

約数の個数: 24

約数和(自身を含む): 43187760

約数和(自身を除く): 22673780

約数列:

[1, 2, 4, 5, 10, 20, 491, 982, 1964, 2089, 2455, 4178, 4910, 8356, 9820, 10445, 20890, 41780, 1025699, 2051398, 4102796, 5128495, 10256990, 20513980]

約数ペア:

[(1, 20513980), (2, 10256990), (4, 5128495), (5, 4102796), (10, 2051398), (20, 1025699), (491, 41780), (982, 20890), (1964, 10445), (2089, 9820), (2455, 8356), (4178, 4910)]