21709990

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{27481}}^1$

素因数の和:27567

約数の個数: 16

約数和(自身を含む): 39574080

約数和(自身を除く): 17864090

約数列:

[1, 2, 5, 10, 79, 158, 395, 790, 27481, 54962, 137405, 274810, 2170999, 4341998, 10854995, 21709990]

約数ペア:

[(1, 21709990), (2, 10854995), (5, 4341998), (10, 2170999), (79, 274810), (158, 137405), (395, 54962), (790, 27481)]