21990447

素因数分解:

$3^4\times {\mathrm{73}}^1\times {\mathrm{3719}}^1$

素因数の和:3804

約数の個数: 20

約数和(自身を含む): 33308880

約数和(自身を除く): 11318433

約数列:

[1, 3, 9, 27, 73, 81, 219, 657, 1971, 3719, 5913, 11157, 33471, 100413, 271487, 301239, 814461, 2443383, 7330149, 21990447]

約数ペア:

[(1, 21990447), (3, 7330149), (9, 2443383), (27, 814461), (73, 301239), (81, 271487), (219, 100413), (657, 33471), (1971, 11157), (3719, 5913)]