21491980

素因数分解:

$2^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{10433}}^1$

素因数の和:10545

約数の個数: 24

約数和(自身を含む): 45575712

約数和(自身を除く): 24083732

約数列:

[1, 2, 4, 5, 10, 20, 103, 206, 412, 515, 1030, 2060, 10433, 20866, 41732, 52165, 104330, 208660, 1074599, 2149198, 4298396, 5372995, 10745990, 21491980]

約数ペア:

[(1, 21491980), (2, 10745990), (4, 5372995), (5, 4298396), (10, 2149198), (20, 1074599), (103, 208660), (206, 104330), (412, 52165), (515, 41732), (1030, 20866), (2060, 10433)]