21721540

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{4327}}^1$

素因数の和:4587

約数の個数: 24

約数和(自身を含む): 45807552

約数和(自身を除く): 24086012

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 4327, 5020, 8654, 17308, 21635, 43270, 86540, 1086077, 2172154, 4344308, 5430385, 10860770, 21721540]

約数ペア:

[(1, 21721540), (2, 10860770), (4, 5430385), (5, 4344308), (10, 2172154), (20, 1086077), (251, 86540), (502, 43270), (1004, 21635), (1255, 17308), (2510, 8654), (4327, 5020)]