81365840

素因数分解:

$2^4\times 5^1\times {\mathrm{727}}^1\times {\mathrm{1399}}^1$

素因数の和:2139

約数の個数: 40

約数和(自身を含む): 189571200

約数和(自身を除く): 108205360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 727, 1399, 1454, 2798, 2908, 3635, 5596, 5816, 6995, 7270, 11192, 11632, 13990, 14540, 22384, 27980, 29080, 55960, 58160, 111920, 1017073, 2034146, 4068292, 5085365, 8136584, 10170730, 16273168, 20341460, 40682920, 81365840]

約数ペア:

[(1, 81365840), (2, 40682920), (4, 20341460), (5, 16273168), (8, 10170730), (10, 8136584), (16, 5085365), (20, 4068292), (40, 2034146), (80, 1017073), (727, 111920), (1399, 58160), (1454, 55960), (2798, 29080), (2908, 27980), (3635, 22384), (5596, 14540), (5816, 13990), (6995, 11632), (7270, 11192)]