21265040

素因数分解:

$2^4\times 5^1\times {\mathrm{265813}}^1$

素因数の和:265826

約数の個数: 20

約数和(自身を含む): 49441404

約数和(自身を除く): 28176364

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265813, 531626, 1063252, 1329065, 2126504, 2658130, 4253008, 5316260, 10632520, 21265040]

約数ペア:

[(1, 21265040), (2, 10632520), (4, 5316260), (5, 4253008), (8, 2658130), (10, 2126504), (16, 1329065), (20, 1063252), (40, 531626), (80, 265813)]