21815915

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{3851}}^1$

素因数の和:3970

約数の個数: 16

約数和(自身を含む): 28843776

約数和(自身を除く): 7027861

約数列:

[1, 5, 11, 55, 103, 515, 1133, 3851, 5665, 19255, 42361, 211805, 396653, 1983265, 4363183, 21815915]

約数ペア:

[(1, 21815915), (5, 4363183), (11, 1983265), (55, 396653), (103, 211805), (515, 42361), (1133, 19255), (3851, 5665)]