21217815

素因数分解:

$3^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{2153}}^1$

素因数の和:2240

約数の個数: 32

約数和(自身を含む): 38255040

約数和(自身を除く): 17037225

約数列:

[1, 3, 5, 9, 15, 27, 45, 73, 135, 219, 365, 657, 1095, 1971, 2153, 3285, 6459, 9855, 10765, 19377, 32295, 58131, 96885, 157169, 290655, 471507, 785845, 1414521, 2357535, 4243563, 7072605, 21217815]

約数ペア:

[(1, 21217815), (3, 7072605), (5, 4243563), (9, 2357535), (15, 1414521), (27, 785845), (45, 471507), (73, 290655), (135, 157169), (219, 96885), (365, 58131), (657, 32295), (1095, 19377), (1971, 10765), (2153, 9855), (3285, 6459)]