28740280

素因数分解:

$2^3\times 5^1\times {\mathrm{661}}^1\times {\mathrm{1087}}^1$

素因数の和:1759

約数の個数: 32

約数和(自身を含む): 64823040

約数和(自身を除く): 36082760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 661, 1087, 1322, 2174, 2644, 3305, 4348, 5288, 5435, 6610, 8696, 10870, 13220, 21740, 26440, 43480, 718507, 1437014, 2874028, 3592535, 5748056, 7185070, 14370140, 28740280]

約数ペア:

[(1, 28740280), (2, 14370140), (4, 7185070), (5, 5748056), (8, 3592535), (10, 2874028), (20, 1437014), (40, 718507), (661, 43480), (1087, 26440), (1322, 21740), (2174, 13220), (2644, 10870), (3305, 8696), (4348, 6610), (5288, 5435)]