21920185

素因数分解:

$5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{8821}}^1$

素因数の和:8904

約数の個数: 16

約数和(自身を含む): 30488832

約数和(自身を除く): 8568647

約数列:

[1, 5, 7, 35, 71, 355, 497, 2485, 8821, 44105, 61747, 308735, 626291, 3131455, 4384037, 21920185]

約数ペア:

[(1, 21920185), (5, 4384037), (7, 3131455), (35, 626291), (71, 308735), (355, 61747), (497, 44105), (2485, 8821)]