21352005

素因数分解:

$3^4\times 5^1\times {\mathrm{52721}}^1$

素因数の和:52738

約数の個数: 20

約数和(自身を含む): 38276172

約数和(自身を除く): 16924167

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52721, 158163, 263605, 474489, 790815, 1423467, 2372445, 4270401, 7117335, 21352005]

約数ペア:

[(1, 21352005), (3, 7117335), (5, 4270401), (9, 2372445), (15, 1423467), (27, 790815), (45, 474489), (81, 263605), (135, 158163), (405, 52721)]