20806569

素因数分解:

$3^2\times 7^1\times {\mathrm{223}}^1\times {\mathrm{1481}}^1$

素因数の和:1717

約数の個数: 24

約数和(自身を含む): 34524672

約数和(自身を除く): 13718103

約数列:

[1, 3, 7, 9, 21, 63, 223, 669, 1481, 1561, 2007, 4443, 4683, 10367, 13329, 14049, 31101, 93303, 330263, 990789, 2311841, 2972367, 6935523, 20806569]

約数ペア:

[(1, 20806569), (3, 6935523), (7, 2972367), (9, 2311841), (21, 990789), (63, 330263), (223, 93303), (669, 31101), (1481, 14049), (1561, 13329), (2007, 10367), (4443, 4683)]