81809720

素因数分解:

$2^3\times 5^1\times {\mathrm{1009}}^1\times {\mathrm{2027}}^1$

素因数の和:3047

約数の個数: 32

約数和(自身を含む): 184345200

約数和(自身を除く): 102535480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1009, 2018, 2027, 4036, 4054, 5045, 8072, 8108, 10090, 10135, 16216, 20180, 20270, 40360, 40540, 81080, 2045243, 4090486, 8180972, 10226215, 16361944, 20452430, 40904860, 81809720]

約数ペア:

[(1, 81809720), (2, 40904860), (4, 20452430), (5, 16361944), (8, 10226215), (10, 8180972), (20, 4090486), (40, 2045243), (1009, 81080), (2018, 40540), (2027, 40360), (4036, 20270), (4054, 20180), (5045, 16216), (8072, 10135), (8108, 10090)]