21391975

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{727}}^1$

素因数の和:855

約数の個数: 24

約数和(自身を含む): 29248128

約数和(自身を除く): 7856153

約数列:

[1, 5, 11, 25, 55, 107, 275, 535, 727, 1177, 2675, 3635, 5885, 7997, 18175, 29425, 39985, 77789, 199925, 388945, 855679, 1944725, 4278395, 21391975]

約数ペア:

[(1, 21391975), (5, 4278395), (11, 1944725), (25, 855679), (55, 388945), (107, 199925), (275, 77789), (535, 39985), (727, 29425), (1177, 18175), (2675, 7997), (3635, 5885)]