20987785

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{239}}^1$

素因数の和:457

約数の個数: 32

約数和(自身を含む): 31288320

約数和(自身を除く): 10300535

約数列:

[1, 5, 7, 13, 35, 65, 91, 193, 239, 455, 965, 1195, 1351, 1673, 2509, 3107, 6755, 8365, 12545, 15535, 17563, 21749, 46127, 87815, 108745, 230635, 322889, 599651, 1614445, 2998255, 4197557, 20987785]

約数ペア:

[(1, 20987785), (5, 4197557), (7, 2998255), (13, 1614445), (35, 599651), (65, 322889), (91, 230635), (193, 108745), (239, 87815), (455, 46127), (965, 21749), (1195, 17563), (1351, 15535), (1673, 12545), (2509, 8365), (3107, 6755)]