20438500

素因数分解:

$2^2\times 5^3\times {\mathrm{41}}^1\times {\mathrm{997}}^1$

素因数の和:1057

約数の個数: 48

約数和(自身を含む): 45772272

約数和(自身を除く): 25333772

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 82, 100, 125, 164, 205, 250, 410, 500, 820, 997, 1025, 1994, 2050, 3988, 4100, 4985, 5125, 9970, 10250, 19940, 20500, 24925, 40877, 49850, 81754, 99700, 124625, 163508, 204385, 249250, 408770, 498500, 817540, 1021925, 2043850, 4087700, 5109625, 10219250, 20438500]

約数ペア:

[(1, 20438500), (2, 10219250), (4, 5109625), (5, 4087700), (10, 2043850), (20, 1021925), (25, 817540), (41, 498500), (50, 408770), (82, 249250), (100, 204385), (125, 163508), (164, 124625), (205, 99700), (250, 81754), (410, 49850), (500, 40877), (820, 24925), (997, 20500), (1025, 19940), (1994, 10250), (2050, 9970), (3988, 5125), (4100, 4985)]