21180380

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81463}}^1$

素因数の和:81485

約数の個数: 24

約数和(自身を含む): 47900832

約数和(自身を除く): 26720452

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81463, 162926, 325852, 407315, 814630, 1059019, 1629260, 2118038, 4236076, 5295095, 10590190, 21180380]

約数ペア:

[(1, 21180380), (2, 10590190), (4, 5295095), (5, 4236076), (10, 2118038), (13, 1629260), (20, 1059019), (26, 814630), (52, 407315), (65, 325852), (130, 162926), (260, 81463)]