21857563

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{199}}^1$

素因数の和:307

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 7172837

約数列:

[1, 7, 13, 17, 71, 91, 119, 199, 221, 497, 923, 1207, 1393, 1547, 2587, 3383, 6461, 8449, 14129, 15691, 18109, 23681, 43979, 98903, 109837, 183677, 240193, 307853, 1285739, 1681351, 3122509, 21857563]

約数ペア:

[(1, 21857563), (7, 3122509), (13, 1681351), (17, 1285739), (71, 307853), (91, 240193), (119, 183677), (199, 109837), (221, 98903), (497, 43979), (923, 23681), (1207, 18109), (1393, 15691), (1547, 14129), (2587, 8449), (3383, 6461)]