21158860

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11887}}^1$

素因数の和:11985

約数の個数: 24

約数和(自身を含む): 44936640

約数和(自身を除く): 23777780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11887, 23774, 47548, 59435, 118870, 237740, 1057943, 2115886, 4231772, 5289715, 10579430, 21158860]

約数ペア:

[(1, 21158860), (2, 10579430), (4, 5289715), (5, 4231772), (10, 2115886), (20, 1057943), (89, 237740), (178, 118870), (356, 59435), (445, 47548), (890, 23774), (1780, 11887)]