20500057 has 4 divisors (see below), whose sum is σ = 20806096. Its totient is φ = 20194020.

The previous prime is 20500049. The next prime is 20500063. The reversal of 20500057 is 75000502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20500057 - 2³ = 20500049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500027) 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 in 3 ways as a sum of consecutive naturals, for example, 152919 + ... + 153052.

It is an arithmetic number, because the mean of its divisors is an integer number (5201524).

Almost surely, 2^20500057 is an apocalyptic number.

It is an amenable number.

20500057 is a deficient number, since it is larger than the sum of its proper divisors (306039).

20500057 is an equidigital number, since it uses as much as digits as its factorization.

20500057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306038.

The product of its (nonzero) digits is 350, while the sum is 19.

The square root of 20500057 is about 4527.6988636613. The cubic root of 20500057 is about 273.6854373991.

Adding to 20500057 its reverse (75000502), we get a palindrome (95500559).

The spelling of 20500057 in words is "twenty million, five hundred thousand, fifty-seven".