21287680

素因数分解:

$2^8\times 5^1\times {\mathrm{16631}}^1$

素因数の和:16652

約数の個数: 36

約数和(自身を含む): 50993712

約数和(自身を除く): 29706032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 16631, 33262, 66524, 83155, 133048, 166310, 266096, 332620, 532192, 665240, 1064384, 1330480, 2128768, 2660960, 4257536, 5321920, 10643840, 21287680]

約数ペア:

[(1, 21287680), (2, 10643840), (4, 5321920), (5, 4257536), (8, 2660960), (10, 2128768), (16, 1330480), (20, 1064384), (32, 665240), (40, 532192), (64, 332620), (80, 266096), (128, 166310), (160, 133048), (256, 83155), (320, 66524), (640, 33262), (1280, 16631)]