21518780

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9871}}^1$

素因数の和:9989

約数の個数: 24

約数和(自身を含む): 45608640

約数和(自身を除く): 24089860

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9871, 19742, 39484, 49355, 98710, 197420, 1075939, 2151878, 4303756, 5379695, 10759390, 21518780]

約数ペア:

[(1, 21518780), (2, 10759390), (4, 5379695), (5, 4303756), (10, 2151878), (20, 1075939), (109, 197420), (218, 98710), (436, 49355), (545, 39484), (1090, 19742), (2180, 9871)]