21038480

素因数分解:

$2^4\times 5^1\times {\mathrm{262981}}^1$

素因数の和:262994

約数の個数: 20

約数和(自身を含む): 48914652

約数和(自身を除く): 27876172

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262981, 525962, 1051924, 1314905, 2103848, 2629810, 4207696, 5259620, 10519240, 21038480]

約数ペア:

[(1, 21038480), (2, 10519240), (4, 5259620), (5, 4207696), (8, 2629810), (10, 2103848), (16, 1314905), (20, 1051924), (40, 525962), (80, 262981)]