20799257 has 2 divisors, whose sum is σ = 20799258. Its totient is φ = 20799256.

The previous prime is 20799223. The next prime is 20799269. The reversal of 20799257 is 75299702.

It is a happy number.

20799257 is nontrivially palindromic in base 7.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 151321 = 4544^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 20799257 - 2¹² = 20795161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20799287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399628 + 10399629.

It is an arithmetic number, because the mean of its divisors is an integer number (10399629).

Almost surely, 2^20799257 is an apocalyptic number.

It is an amenable number.

20799257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20799257 is an equidigital number, since it uses as much as digits as its factorization.

20799257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 20799257 is about 4560.6202429056. The cubic root of 20799257 is about 275.0104987727.

The spelling of 20799257 in words is "twenty million, seven hundred ninety-nine thousand, two hundred fifty-seven".