21128145

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{1303}}^1$

素因数の和:1381

約数の個数: 32

約数和(自身を含む): 36052992

約数和(自身を除く): 14924847

約数列:

[1, 3, 5, 15, 23, 47, 69, 115, 141, 235, 345, 705, 1081, 1303, 3243, 3909, 5405, 6515, 16215, 19545, 29969, 61241, 89907, 149845, 183723, 306205, 449535, 918615, 1408543, 4225629, 7042715, 21128145]

約数ペア:

[(1, 21128145), (3, 7042715), (5, 4225629), (15, 1408543), (23, 918615), (47, 449535), (69, 306205), (115, 183723), (141, 149845), (235, 89907), (345, 61241), (705, 29969), (1081, 19545), (1303, 16215), (3243, 6515), (3909, 5405)]