21218847

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1$

素因数の和:263

約数の個数: 32

約数和(自身を含む): 31610880

約数和(自身を除く): 10392033

約数列:

[1, 3, 13, 39, 71, 79, 97, 213, 237, 291, 923, 1027, 1261, 2769, 3081, 3783, 5609, 6887, 7663, 16827, 20661, 22989, 72917, 89531, 99619, 218751, 268593, 298857, 544073, 1632219, 7072949, 21218847]

約数ペア:

[(1, 21218847), (3, 7072949), (13, 1632219), (39, 544073), (71, 298857), (79, 268593), (97, 218751), (213, 99619), (237, 89531), (291, 72917), (923, 22989), (1027, 20661), (1261, 16827), (2769, 7663), (3081, 6887), (3783, 5609)]