21781240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41887}}^1$

素因数の和:41911

約数の個数: 32

約数和(自身を含む): 52778880

約数和(自身を除く): 30997640

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 41887, 83774, 167548, 209435, 335096, 418870, 544531, 837740, 1089062, 1675480, 2178124, 2722655, 4356248, 5445310, 10890620, 21781240]

約数ペア:

[(1, 21781240), (2, 10890620), (4, 5445310), (5, 4356248), (8, 2722655), (10, 2178124), (13, 1675480), (20, 1089062), (26, 837740), (40, 544531), (52, 418870), (65, 335096), (104, 209435), (130, 167548), (260, 83774), (520, 41887)]