20892857 has 2 divisors, whose sum is σ = 20892858. Its totient is φ = 20892856.

The previous prime is 20892757. The next prime is 20892871. The reversal of 20892857 is 75829802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 606841 = 4504^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20892857 - 2²⁰ = 19844281 is a prime.

It is a super-2 number, since 2×20892857² = 873022947244898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20892757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446428 + 10446429.

It is an arithmetic number, because the mean of its divisors is an integer number (10446429).

Almost surely, 2^20892857 is an apocalyptic number.

It is an amenable number.

20892857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20892857 is an equidigital number, since it uses as much as digits as its factorization.

20892857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 20892857 is about 4570.8704860234. The cubic root of 20892857 is about 275.4224119816.

The spelling of 20892857 in words is "twenty million, eight hundred ninety-two thousand, eight hundred fifty-seven".