21203289

素因数分解:

$3^4\times {\mathrm{67}}^1\times {\mathrm{3907}}^1$

素因数の和:3986

約数の個数: 20

約数和(自身を含む): 32155024

約数和(自身を除く): 10951735

約数列:

[1, 3, 9, 27, 67, 81, 201, 603, 1809, 3907, 5427, 11721, 35163, 105489, 261769, 316467, 785307, 2355921, 7067763, 21203289]

約数ペア:

[(1, 21203289), (3, 7067763), (9, 2355921), (27, 785307), (67, 316467), (81, 261769), (201, 105489), (603, 35163), (1809, 11721), (3907, 5427)]