20223857 has 2 divisors, whose sum is σ = 20223858. Its totient is φ = 20223856.

The previous prime is 20223839. The next prime is 20223871. The reversal of 20223857 is 75832202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 474721 = 4444^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223857 - 2²⁰ = 19175281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20223257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111928 + 10111929.

It is an arithmetic number, because the mean of its divisors is an integer number (10111929).

Almost surely, 2^20223857 is an apocalyptic number.

It is an amenable number.

20223857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223857 is an equidigital number, since it uses as much as digits as its factorization.

20223857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20223857 is about 4497.0942840906. The cubic root of 20223857 is about 272.4507421557.

The spelling of 20223857 in words is "twenty million, two hundred twenty-three thousand, eight hundred fifty-seven".