21805785

素因数分解:

$3^2\times 5^1\times {\mathrm{173}}^1\times {\mathrm{2801}}^1$

素因数の和:2985

約数の個数: 24

約数和(自身を含む): 38028744

約数和(自身を除く): 16222959

約数列:

[1, 3, 5, 9, 15, 45, 173, 519, 865, 1557, 2595, 2801, 7785, 8403, 14005, 25209, 42015, 126045, 484573, 1453719, 2422865, 4361157, 7268595, 21805785]

約数ペア:

[(1, 21805785), (3, 7268595), (5, 4361157), (9, 2422865), (15, 1453719), (45, 484573), (173, 126045), (519, 42015), (865, 25209), (1557, 14005), (2595, 8403), (2801, 7785)]