21262480

素因数分解:

$2^4\times 5^1\times {\mathrm{265781}}^1$

素因数の和:265794

約数の個数: 20

約数和(自身を含む): 49435452

約数和(自身を除く): 28172972

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265781, 531562, 1063124, 1328905, 2126248, 2657810, 4252496, 5315620, 10631240, 21262480]

約数ペア:

[(1, 21262480), (2, 10631240), (4, 5315620), (5, 4252496), (8, 2657810), (10, 2126248), (16, 1328905), (20, 1063124), (40, 531562), (80, 265781)]