21620980

素因数分解:

$2^2\times 5^1\times {\mathrm{727}}^1\times {\mathrm{1487}}^1$

素因数の和:2223

約数の個数: 24

約数和(自身を含む): 45497088

約数和(自身を除く): 23876108

約数列:

[1, 2, 4, 5, 10, 20, 727, 1454, 1487, 2908, 2974, 3635, 5948, 7270, 7435, 14540, 14870, 29740, 1081049, 2162098, 4324196, 5405245, 10810490, 21620980]

約数ペア:

[(1, 21620980), (2, 10810490), (4, 5405245), (5, 4324196), (10, 2162098), (20, 1081049), (727, 29740), (1454, 14870), (1487, 14540), (2908, 7435), (2974, 7270), (3635, 5948)]