21269680

素因数分解:

$2^4\times 5^1\times {\mathrm{265871}}^1$

素因数の和:265884

約数の個数: 20

約数和(自身を含む): 49452192

約数和(自身を除く): 28182512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265871, 531742, 1063484, 1329355, 2126968, 2658710, 4253936, 5317420, 10634840, 21269680]

約数ペア:

[(1, 21269680), (2, 10634840), (4, 5317420), (5, 4253936), (8, 2658710), (10, 2126968), (16, 1329355), (20, 1063484), (40, 531742), (80, 265871)]