21555760

素因数分解:

$2^4\times 5^1\times {\mathrm{211}}^1\times {\mathrm{1277}}^1$

素因数の和:1501

約数の個数: 40

約数和(自身を含む): 50394096

約数和(自身を除く): 28838336

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 211, 422, 844, 1055, 1277, 1688, 2110, 2554, 3376, 4220, 5108, 6385, 8440, 10216, 12770, 16880, 20432, 25540, 51080, 102160, 269447, 538894, 1077788, 1347235, 2155576, 2694470, 4311152, 5388940, 10777880, 21555760]

約数ペア:

[(1, 21555760), (2, 10777880), (4, 5388940), (5, 4311152), (8, 2694470), (10, 2155576), (16, 1347235), (20, 1077788), (40, 538894), (80, 269447), (211, 102160), (422, 51080), (844, 25540), (1055, 20432), (1277, 16880), (1688, 12770), (2110, 10216), (2554, 8440), (3376, 6385), (4220, 5108)]