21981125

素因数分解:

$5^3\times {\mathrm{41}}^1\times {\mathrm{4289}}^1$

素因数の和:4345

約数の個数: 16

約数和(自身を含む): 28108080

約数和(自身を除く): 6126955

約数列:

[1, 5, 25, 41, 125, 205, 1025, 4289, 5125, 21445, 107225, 175849, 536125, 879245, 4396225, 21981125]

約数ペア:

[(1, 21981125), (5, 4396225), (25, 879245), (41, 536125), (125, 175849), (205, 107225), (1025, 21445), (4289, 5125)]