21801580

素因数分解:

$2^2\times 5^1\times {\mathrm{239}}^1\times {\mathrm{4561}}^1$

素因数の和:4809

約数の個数: 24

約数和(自身を含む): 45984960

約数和(自身を除く): 24183380

約数列:

[1, 2, 4, 5, 10, 20, 239, 478, 956, 1195, 2390, 4561, 4780, 9122, 18244, 22805, 45610, 91220, 1090079, 2180158, 4360316, 5450395, 10900790, 21801580]

約数ペア:

[(1, 21801580), (2, 10900790), (4, 5450395), (5, 4360316), (10, 2180158), (20, 1090079), (239, 91220), (478, 45610), (956, 22805), (1195, 18244), (2390, 9122), (4561, 4780)]