18780993

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{661}}^1$

素因数の和:726

約数の個数: 48

約数和(自身を含む): 34699392

約数和(自身を除く): 15918399

約数列:

[1, 3, 7, 9, 11, 21, 33, 41, 63, 77, 99, 123, 231, 287, 369, 451, 661, 693, 861, 1353, 1983, 2583, 3157, 4059, 4627, 5949, 7271, 9471, 13881, 21813, 27101, 28413, 41643, 50897, 65439, 81303, 152691, 189707, 243909, 298111, 458073, 569121, 894333, 1707363, 2086777, 2682999, 6260331, 18780993]

約数ペア:

[(1, 18780993), (3, 6260331), (7, 2682999), (9, 2086777), (11, 1707363), (21, 894333), (33, 569121), (41, 458073), (63, 298111), (77, 243909), (99, 189707), (123, 152691), (231, 81303), (287, 65439), (369, 50897), (451, 41643), (661, 28413), (693, 27101), (861, 21813), (1353, 13881), (1983, 9471), (2583, 7271), (3157, 5949), (4059, 4627)]