21087940

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25717}}^1$

素因数の和:25767

約数の個数: 24

約数和(自身を含む): 45366552

約数和(自身を除く): 24278612

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25717, 51434, 102868, 128585, 257170, 514340, 1054397, 2108794, 4217588, 5271985, 10543970, 21087940]

約数ペア:

[(1, 21087940), (2, 10543970), (4, 5271985), (5, 4217588), (10, 2108794), (20, 1054397), (41, 514340), (82, 257170), (164, 128585), (205, 102868), (410, 51434), (820, 25717)]