20509137

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{509}}^1$

素因数の和:574

約数の個数: 36

約数和(自身を含む): 33508020

約数和(自身を除く): 12998883

約数列:

[1, 3, 9, 11, 33, 37, 99, 111, 121, 333, 363, 407, 509, 1089, 1221, 1527, 3663, 4477, 4581, 5599, 13431, 16797, 18833, 40293, 50391, 56499, 61589, 169497, 184767, 207163, 554301, 621489, 1864467, 2278793, 6836379, 20509137]

約数ペア:

[(1, 20509137), (3, 6836379), (9, 2278793), (11, 1864467), (33, 621489), (37, 554301), (99, 207163), (111, 184767), (121, 169497), (333, 61589), (363, 56499), (407, 50391), (509, 40293), (1089, 18833), (1221, 16797), (1527, 13431), (3663, 5599), (4477, 4581)]