21038885

素因数分解:

$5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{1087}}^1$

素因数の和:1185

約数の個数: 24

約数和(自身を含む): 29767680

約数和(自身を除く): 8728795

約数列:

[1, 5, 7, 35, 49, 79, 245, 395, 553, 1087, 2765, 3871, 5435, 7609, 19355, 38045, 53263, 85873, 266315, 429365, 601111, 3005555, 4207777, 21038885]

約数ペア:

[(1, 21038885), (5, 4207777), (7, 3005555), (35, 601111), (49, 429365), (79, 266315), (245, 85873), (395, 53263), (553, 38045), (1087, 19355), (2765, 7609), (3871, 5435)]