21380121

素因数分解:

$3^2\times 7^2\times {\mathrm{48481}}^1$

素因数の和:48501

約数の個数: 18

約数和(自身を含む): 35925162

約数和(自身を除く): 14545041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 48481, 145443, 339367, 436329, 1018101, 2375569, 3054303, 7126707, 21380121]

約数ペア:

[(1, 21380121), (3, 7126707), (7, 3054303), (9, 2375569), (21, 1018101), (49, 436329), (63, 339367), (147, 145443), (441, 48481)]