861440

素因数分解:

$2^8\times 5^1\times {\mathrm{673}}^1$

素因数の和:694

約数の個数: 36

約数和(自身を含む): 2066484

約数和(自身を除く): 1205044

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 673, 1280, 1346, 2692, 3365, 5384, 6730, 10768, 13460, 21536, 26920, 43072, 53840, 86144, 107680, 172288, 215360, 430720, 861440]

約数ペア:

[(1, 861440), (2, 430720), (4, 215360), (5, 172288), (8, 107680), (10, 86144), (16, 53840), (20, 43072), (32, 26920), (40, 21536), (64, 13460), (80, 10768), (128, 6730), (160, 5384), (256, 3365), (320, 2692), (640, 1346), (673, 1280)]