20781760

素因数分解:

$2^6\times 5^1\times {\mathrm{101}}^1\times {\mathrm{643}}^1$

素因数の和:761

約数の個数: 56

約数和(自身を含む): 50054256

約数和(自身を除く): 29272496

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 101, 160, 202, 320, 404, 505, 643, 808, 1010, 1286, 1616, 2020, 2572, 3215, 3232, 4040, 5144, 6430, 6464, 8080, 10288, 12860, 16160, 20576, 25720, 32320, 41152, 51440, 64943, 102880, 129886, 205760, 259772, 324715, 519544, 649430, 1039088, 1298860, 2078176, 2597720, 4156352, 5195440, 10390880, 20781760]

約数ペア:

[(1, 20781760), (2, 10390880), (4, 5195440), (5, 4156352), (8, 2597720), (10, 2078176), (16, 1298860), (20, 1039088), (32, 649430), (40, 519544), (64, 324715), (80, 259772), (101, 205760), (160, 129886), (202, 102880), (320, 64943), (404, 51440), (505, 41152), (643, 32320), (808, 25720), (1010, 20576), (1286, 16160), (1616, 12860), (2020, 10288), (2572, 8080), (3215, 6464), (3232, 6430), (4040, 5144)]