21043885

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{137}}^1\times {\mathrm{991}}^1$

素因数の和:1164

約数の個数: 16

約数和(自身を含む): 26284032

約数和(自身を除く): 5240147

約数列:

[1, 5, 31, 137, 155, 685, 991, 4247, 4955, 21235, 30721, 135767, 153605, 678835, 4208777, 21043885]

約数ペア:

[(1, 21043885), (5, 4208777), (31, 678835), (137, 153605), (155, 135767), (685, 30721), (991, 21235), (4247, 4955)]