21128965

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{1019}}^1$

素因数の和:1077

約数の個数: 32

約数和(自身を含む): 30844800

約数和(自身を除く): 9715835

約数列:

[1, 5, 11, 13, 29, 55, 65, 143, 145, 319, 377, 715, 1019, 1595, 1885, 4147, 5095, 11209, 13247, 20735, 29551, 56045, 66235, 145717, 147755, 325061, 384163, 728585, 1625305, 1920815, 4225793, 21128965]

約数ペア:

[(1, 21128965), (5, 4225793), (11, 1920815), (13, 1625305), (29, 728585), (55, 384163), (65, 325061), (143, 147755), (145, 145717), (319, 66235), (377, 56045), (715, 29551), (1019, 20735), (1595, 13247), (1885, 11209), (4147, 5095)]