21045820

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14821}}^1$

素因数の和:14901

約数の個数: 24

約数和(自身を含む): 44821728

約数和(自身を除く): 23775908

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14821, 29642, 59284, 74105, 148210, 296420, 1052291, 2104582, 4209164, 5261455, 10522910, 21045820]

約数ペア:

[(1, 21045820), (2, 10522910), (4, 5261455), (5, 4209164), (10, 2104582), (20, 1052291), (71, 296420), (142, 148210), (284, 74105), (355, 59284), (710, 29642), (1420, 14821)]