20504136 has 32 divisors (see below), whose sum is σ = 51516000. Its totient is φ = 6800640.

The previous prime is 20504129. The next prime is 20504137. The reversal of 20504136 is 63140502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20504137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3040 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (1609875).

Almost surely, 2^20504136 is an apocalyptic number.

It is an amenable number.

20504136 is an abundant number, since it is smaller than the sum of its proper divisors (31011864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20504136 is a wasteful number, since it uses less digits than its factorization.

20504136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269 (or 4265 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20504136 is about 4528.1492908251. The cubic root of 20504136 is about 273.7035883871.

Adding to 20504136 its reverse (63140502), we get a palindrome (83644638).

The spelling of 20504136 in words is "twenty million, five hundred four thousand, one hundred thirty-six".