20451905

素因数分解:

$5^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{1087}}^1$

素因数の和:1216

約数の個数: 16

約数和(自身を含む): 25380864

約数和(自身を除く): 4928959

約数列:

[1, 5, 53, 71, 265, 355, 1087, 3763, 5435, 18815, 57611, 77177, 288055, 385885, 4090381, 20451905]

約数ペア:

[(1, 20451905), (5, 4090381), (53, 385885), (71, 288055), (265, 77177), (355, 57611), (1087, 18815), (3763, 5435)]