21023980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25639}}^1$

素因数の和:25689

約数の個数: 24

約数和(自身を含む): 45228960

約数和(自身を除く): 24204980

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25639, 51278, 102556, 128195, 256390, 512780, 1051199, 2102398, 4204796, 5255995, 10511990, 21023980]

約数ペア:

[(1, 21023980), (2, 10511990), (4, 5255995), (5, 4204796), (10, 2102398), (20, 1051199), (41, 512780), (82, 256390), (164, 128195), (205, 102556), (410, 51278), (820, 25639)]