21288580

素因数分解:

$2^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{15887}}^1$

素因数の和:15963

約数の個数: 24

約数和(自身を含む): 45376128

約数和(自身を除く): 24087548

約数列:

[1, 2, 4, 5, 10, 20, 67, 134, 268, 335, 670, 1340, 15887, 31774, 63548, 79435, 158870, 317740, 1064429, 2128858, 4257716, 5322145, 10644290, 21288580]

約数ペア:

[(1, 21288580), (2, 10644290), (4, 5322145), (5, 4257716), (10, 2128858), (20, 1064429), (67, 317740), (134, 158870), (268, 79435), (335, 63548), (670, 31774), (1340, 15887)]