19979980

素因数分解:

$2^2\times 5^1\times {\mathrm{179}}^1\times {\mathrm{5581}}^1$

素因数の和:5769

約数の個数: 24

約数和(自身を含む): 42199920

約数和(自身を除く): 22219940

約数列:

[1, 2, 4, 5, 10, 20, 179, 358, 716, 895, 1790, 3580, 5581, 11162, 22324, 27905, 55810, 111620, 998999, 1997998, 3995996, 4994995, 9989990, 19979980]

約数ペア:

[(1, 19979980), (2, 9989990), (4, 4994995), (5, 3995996), (10, 1997998), (20, 998999), (179, 111620), (358, 55810), (716, 27905), (895, 22324), (1790, 11162), (3580, 5581)]