21161216

素因数分解:

$2^8\times {\mathrm{131}}^1\times {\mathrm{631}}^1$

素因数の和:778

約数の個数: 36

約数和(自身を含む): 42629664

約数和(自身を除く): 21468448

約数列:

[1, 2, 4, 8, 16, 32, 64, 128, 131, 256, 262, 524, 631, 1048, 1262, 2096, 2524, 4192, 5048, 8384, 10096, 16768, 20192, 33536, 40384, 80768, 82661, 161536, 165322, 330644, 661288, 1322576, 2645152, 5290304, 10580608, 21161216]

約数ペア:

[(1, 21161216), (2, 10580608), (4, 5290304), (8, 2645152), (16, 1322576), (32, 661288), (64, 330644), (128, 165322), (131, 161536), (256, 82661), (262, 80768), (524, 40384), (631, 33536), (1048, 20192), (1262, 16768), (2096, 10096), (2524, 8384), (4192, 5048)]