21507681

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{223}}^1\times {\mathrm{2473}}^1$

素因数の和:2712

約数の個数: 16

約数和(自身を含む): 31033856

約数和(自身を除く): 9526175

約数列:

[1, 3, 13, 39, 223, 669, 2473, 2899, 7419, 8697, 32149, 96447, 551479, 1654437, 7169227, 21507681]

約数ペア:

[(1, 21507681), (3, 7169227), (13, 1654437), (39, 551479), (223, 96447), (669, 32149), (2473, 8697), (2899, 7419)]