81191920

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9311}}^1$

素因数の和:9433

約数の個数: 40

約数和(自身を含む): 190523520

約数和(自身を除く): 109331600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 4360, 8720, 9311, 18622, 37244, 46555, 74488, 93110, 148976, 186220, 372440, 744880, 1014899, 2029798, 4059596, 5074495, 8119192, 10148990, 16238384, 20297980, 40595960, 81191920]

約数ペア:

[(1, 81191920), (2, 40595960), (4, 20297980), (5, 16238384), (8, 10148990), (10, 8119192), (16, 5074495), (20, 4059596), (40, 2029798), (80, 1014899), (109, 744880), (218, 372440), (436, 186220), (545, 148976), (872, 93110), (1090, 74488), (1744, 46555), (2180, 37244), (4360, 18622), (8720, 9311)]