21190815

素因数分解:

$3^5\times 5^1\times {\mathrm{107}}^1\times {\mathrm{163}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 38683008

約数和(自身を除く): 17492193

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 107, 135, 163, 243, 321, 405, 489, 535, 815, 963, 1215, 1467, 1605, 2445, 2889, 4401, 4815, 7335, 8667, 13203, 14445, 17441, 22005, 26001, 39609, 43335, 52323, 66015, 87205, 130005, 156969, 198045, 261615, 470907, 784845, 1412721, 2354535, 4238163, 7063605, 21190815]

約数ペア:

[(1, 21190815), (3, 7063605), (5, 4238163), (9, 2354535), (15, 1412721), (27, 784845), (45, 470907), (81, 261615), (107, 198045), (135, 156969), (163, 130005), (243, 87205), (321, 66015), (405, 52323), (489, 43335), (535, 39609), (815, 26001), (963, 22005), (1215, 17441), (1467, 14445), (1605, 13203), (2445, 8667), (2889, 7335), (4401, 4815)]