21281221640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{2081}}^1\times {\mathrm{36523}}^1$

素因数の和:38622

約数の個数: 64

約数和(自身を含む): 54750936960

約数和(自身を除く): 33469715320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 2081, 4162, 8324, 10405, 14567, 16648, 20810, 29134, 36523, 41620, 58268, 72835, 73046, 83240, 116536, 145670, 146092, 182615, 255661, 291340, 292184, 365230, 511322, 582680, 730460, 1022644, 1278305, 1460920, 2045288, 2556610, 5113220, 10226440, 76004363, 152008726, 304017452, 380021815, 532030541, 608034904, 760043630, 1064061082, 1520087260, 2128122164, 2660152705, 3040174520, 4256244328, 5320305410, 10640610820, 21281221640]

約数ペア:

[(1, 21281221640), (2, 10640610820), (4, 5320305410), (5, 4256244328), (7, 3040174520), (8, 2660152705), (10, 2128122164), (14, 1520087260), (20, 1064061082), (28, 760043630), (35, 608034904), (40, 532030541), (56, 380021815), (70, 304017452), (140, 152008726), (280, 76004363), (2081, 10226440), (4162, 5113220), (8324, 2556610), (10405, 2045288), (14567, 1460920), (16648, 1278305), (20810, 1022644), (29134, 730460), (36523, 582680), (41620, 511322), (58268, 365230), (72835, 292184), (73046, 291340), (83240, 255661), (116536, 182615), (145670, 146092)]