645008

素因数分解:

$2^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{443}}^1$

素因数の和:471

約数の個数: 40

約数和(自身を含む): 1541568

約数和(自身を除く): 896560

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 52, 56, 91, 104, 112, 182, 208, 364, 443, 728, 886, 1456, 1772, 3101, 3544, 5759, 6202, 7088, 11518, 12404, 23036, 24808, 40313, 46072, 49616, 80626, 92144, 161252, 322504, 645008]

約数ペア:

[(1, 645008), (2, 322504), (4, 161252), (7, 92144), (8, 80626), (13, 49616), (14, 46072), (16, 40313), (26, 24808), (28, 23036), (52, 12404), (56, 11518), (91, 7088), (104, 6202), (112, 5759), (182, 3544), (208, 3101), (364, 1772), (443, 1456), (728, 886)]