21691240

素因数分解:

$2^3\times 5^1\times {\mathrm{542281}}^1$

素因数の和:542292

約数の個数: 16

約数和(自身を含む): 48805380

約数和(自身を除く): 27114140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 542281, 1084562, 2169124, 2711405, 4338248, 5422810, 10845620, 21691240]

約数ペア:

[(1, 21691240), (2, 10845620), (4, 5422810), (5, 4338248), (8, 2711405), (10, 2169124), (20, 1084562), (40, 542281)]