21280540

素因数分解:

$2^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{15881}}^1$

素因数の和:15957

約数の個数: 24

約数和(自身を含む): 45358992

約数和(自身を除く): 24078452

約数列:

[1, 2, 4, 5, 10, 20, 67, 134, 268, 335, 670, 1340, 15881, 31762, 63524, 79405, 158810, 317620, 1064027, 2128054, 4256108, 5320135, 10640270, 21280540]

約数ペア:

[(1, 21280540), (2, 10640270), (4, 5320135), (5, 4256108), (10, 2128054), (20, 1064027), (67, 317620), (134, 158810), (268, 79405), (335, 63524), (670, 31762), (1340, 15881)]