20891395

素因数分解:

$5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{1201}}^1$

素因数の和:1291

約数の個数: 24

約数和(自身を含む): 29598048

約数和(自身を除く): 8706653

約数列:

[1, 5, 7, 35, 49, 71, 245, 355, 497, 1201, 2485, 3479, 6005, 8407, 17395, 42035, 58849, 85271, 294245, 426355, 596897, 2984485, 4178279, 20891395]

約数ペア:

[(1, 20891395), (5, 4178279), (7, 2984485), (35, 596897), (49, 426355), (71, 294245), (245, 85271), (355, 58849), (497, 42035), (1201, 17395), (2485, 8407), (3479, 6005)]