21490780

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10639}}^1$

素因数の和:10749

約数の個数: 24

約数和(自身を含む): 45581760

約数和(自身を除く): 24090980

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10639, 21278, 42556, 53195, 106390, 212780, 1074539, 2149078, 4298156, 5372695, 10745390, 21490780]

約数ペア:

[(1, 21490780), (2, 10745390), (4, 5372695), (5, 4298156), (10, 2149078), (20, 1074539), (101, 212780), (202, 106390), (404, 53195), (505, 42556), (1010, 21278), (2020, 10639)]