645760

素因数分解:

$2^7\times 5^1\times {\mathrm{1009}}^1$

素因数の和:1028

約数の個数: 32

約数和(自身を含む): 1545300

約数和(自身を除く): 899540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 1009, 2018, 4036, 5045, 8072, 10090, 16144, 20180, 32288, 40360, 64576, 80720, 129152, 161440, 322880, 645760]

約数ペア:

[(1, 645760), (2, 322880), (4, 161440), (5, 129152), (8, 80720), (10, 64576), (16, 40360), (20, 32288), (32, 20180), (40, 16144), (64, 10090), (80, 8072), (128, 5045), (160, 4036), (320, 2018), (640, 1009)]