21256984

素因数分解:

$2^3\times 7^2\times {\mathrm{211}}^1\times {\mathrm{257}}^1$

素因数の和:488

約数の個数: 48

約数和(自身を含む): 46765080

約数和(自身を除く): 25508096

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 211, 257, 392, 422, 514, 844, 1028, 1477, 1688, 1799, 2056, 2954, 3598, 5908, 7196, 10339, 11816, 12593, 14392, 20678, 25186, 41356, 50372, 54227, 82712, 100744, 108454, 216908, 379589, 433816, 759178, 1518356, 2657123, 3036712, 5314246, 10628492, 21256984]

約数ペア:

[(1, 21256984), (2, 10628492), (4, 5314246), (7, 3036712), (8, 2657123), (14, 1518356), (28, 759178), (49, 433816), (56, 379589), (98, 216908), (196, 108454), (211, 100744), (257, 82712), (392, 54227), (422, 50372), (514, 41356), (844, 25186), (1028, 20678), (1477, 14392), (1688, 12593), (1799, 11816), (2056, 10339), (2954, 7196), (3598, 5908)]