20902480

素因数分解:

$2^4\times 5^1\times {\mathrm{261281}}^1$

素因数の和:261294

約数の個数: 20

約数和(自身を含む): 48598452

約数和(自身を除く): 27695972

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 261281, 522562, 1045124, 1306405, 2090248, 2612810, 4180496, 5225620, 10451240, 20902480]

約数ペア:

[(1, 20902480), (2, 10451240), (4, 5225620), (5, 4180496), (8, 2612810), (10, 2090248), (16, 1306405), (20, 1045124), (40, 522562), (80, 261281)]