21248919

素因数分解:

$3^3\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{479}}^1$

素因数の和:572

約数の個数: 32

約数和(自身を含む): 33177600

約数和(自身を除く): 11928681

約数列:

[1, 3, 9, 27, 31, 53, 93, 159, 279, 477, 479, 837, 1431, 1437, 1643, 4311, 4929, 12933, 14787, 14849, 25387, 44361, 44547, 76161, 133641, 228483, 400923, 685449, 786997, 2360991, 7082973, 21248919]

約数ペア:

[(1, 21248919), (3, 7082973), (9, 2360991), (27, 786997), (31, 685449), (53, 400923), (93, 228483), (159, 133641), (279, 76161), (477, 44547), (479, 44361), (837, 25387), (1431, 14849), (1437, 14787), (1643, 12933), (4311, 4929)]