19641620

素因数分解:

$2^2\times 5^1\times {\mathrm{991}}^2$

素因数の和:1991

約数の個数: 18

約数和(自身を含む): 41289066

約数和(自身を除く): 21647446

約数列:

[1, 2, 4, 5, 10, 20, 991, 1982, 3964, 4955, 9910, 19820, 982081, 1964162, 3928324, 4910405, 9820810, 19641620]

約数ペア:

[(1, 19641620), (2, 9820810), (4, 4910405), (5, 3928324), (10, 1964162), (20, 982081), (991, 19820), (1982, 9910), (3964, 4955)]