643840

素因数分解:

$2^8\times 5^1\times {\mathrm{503}}^1$

素因数の和:524

約数の個数: 36

約数和(自身を含む): 1545264

約数和(自身を除く): 901424

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 503, 640, 1006, 1280, 2012, 2515, 4024, 5030, 8048, 10060, 16096, 20120, 32192, 40240, 64384, 80480, 128768, 160960, 321920, 643840]

約数ペア:

[(1, 643840), (2, 321920), (4, 160960), (5, 128768), (8, 80480), (10, 64384), (16, 40240), (20, 32192), (32, 20120), (40, 16096), (64, 10060), (80, 8048), (128, 5030), (160, 4024), (256, 2515), (320, 2012), (503, 1280), (640, 1006)]