21178905

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{2731}}^1$

素因数の和:2797

約数の個数: 32

約数和(自身を含む): 37767168

約数和(自身を除く): 16588263

約数列:

[1, 3, 5, 11, 15, 33, 47, 55, 141, 165, 235, 517, 705, 1551, 2585, 2731, 7755, 8193, 13655, 30041, 40965, 90123, 128357, 150205, 385071, 450615, 641785, 1411927, 1925355, 4235781, 7059635, 21178905]

約数ペア:

[(1, 21178905), (3, 7059635), (5, 4235781), (11, 1925355), (15, 1411927), (33, 641785), (47, 450615), (55, 385071), (141, 150205), (165, 128357), (235, 90123), (517, 40965), (705, 30041), (1551, 13655), (2585, 8193), (2731, 7755)]