21402865

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12553}}^1$

素因数の和:12600

約数の個数: 16

約数和(自身を含む): 28924416

約数和(自身を除く): 7521551

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12553, 62765, 138083, 389143, 690415, 1945715, 4280573, 21402865]

約数ペア:

[(1, 21402865), (5, 4280573), (11, 1945715), (31, 690415), (55, 389143), (155, 138083), (341, 62765), (1705, 12553)]