20406561

素因数分解:

$3^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{137}}^1\times {\mathrm{173}}^1$

素因数の和:361

約数の個数: 32

約数和(自身を含む): 32272128

約数和(自身を除く): 11865567

約数列:

[1, 3, 7, 21, 41, 123, 137, 173, 287, 411, 519, 861, 959, 1211, 2877, 3633, 5617, 7093, 16851, 21279, 23701, 39319, 49651, 71103, 117957, 148953, 165907, 497721, 971741, 2915223, 6802187, 20406561]

約数ペア:

[(1, 20406561), (3, 6802187), (7, 2915223), (21, 971741), (41, 497721), (123, 165907), (137, 148953), (173, 117957), (287, 71103), (411, 49651), (519, 39319), (861, 23701), (959, 21279), (1211, 16851), (2877, 7093), (3633, 5617)]