19987281

素因数分解:

$3^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{1009}}^1$

素因数の和:1117

約数の個数: 24

約数和(自身を含む): 30251520

約数和(自身を除く): 10264239

約数列:

[1, 3, 9, 31, 71, 93, 213, 279, 639, 1009, 2201, 3027, 6603, 9081, 19809, 31279, 71639, 93837, 214917, 281511, 644751, 2220809, 6662427, 19987281]

約数ペア:

[(1, 19987281), (3, 6662427), (9, 2220809), (31, 644751), (71, 281511), (93, 214917), (213, 93837), (279, 71639), (639, 31279), (1009, 19809), (2201, 9081), (3027, 6603)]