21454360

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{2087}}^1$

素因数の和:2355

約数の個数: 32

約数和(自身を含む): 48483360

約数和(自身を除く): 27029000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2087, 2570, 4174, 5140, 8348, 10280, 10435, 16696, 20870, 41740, 83480, 536359, 1072718, 2145436, 2681795, 4290872, 5363590, 10727180, 21454360]

約数ペア:

[(1, 21454360), (2, 10727180), (4, 5363590), (5, 4290872), (8, 2681795), (10, 2145436), (20, 1072718), (40, 536359), (257, 83480), (514, 41740), (1028, 20870), (1285, 16696), (2056, 10435), (2087, 10280), (2570, 8348), (4174, 5140)]