20535057 has 6 divisors (see below), whose sum is σ = 29661762. Its totient is φ = 13690032.

The previous prime is 20535049. The next prime is 20535061. The reversal of 20535057 is 75053502.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 2692881 = 4224^2 + 1641^2 .

It is not a de Polignac number, because 20535057 - 2³ = 20535049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20535057.

It is not an unprimeable number, because it can be changed into a prime (20535157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140828 + ... + 1140845.

It is an arithmetic number, because the mean of its divisors is an integer number (4943627).

Almost surely, 2^20535057 is an apocalyptic number.

It is an amenable number.

20535057 is a deficient number, since it is larger than the sum of its proper divisors (9126705).

20535057 is a wasteful number, since it uses less digits than its factorization.

20535057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281679 (or 2281676 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 20535057 is about 4531.5623133749. The cubic root of 20535057 is about 273.8411043489.

Adding to 20535057 its reverse (75053502), we get a palindrome (95588559).

The spelling of 20535057 in words is "twenty million, five hundred thirty-five thousand, fifty-seven".