21217778

素因数分解:

$2^1\times {\mathrm{89}}^1\times {\mathrm{199}}^1\times {\mathrm{599}}^1$

素因数の和:889

約数の個数: 16

約数和(自身を含む): 32400000

約数和(自身を除く): 11182222

約数列:

[1, 2, 89, 178, 199, 398, 599, 1198, 17711, 35422, 53311, 106622, 119201, 238402, 10608889, 21217778]

約数ペア:

[(1, 21217778), (2, 10608889), (89, 238402), (178, 119201), (199, 106622), (398, 53311), (599, 35422), (1198, 17711)]