20512204136 has 16 divisors (see below), whose sum is σ = 39786603300. Its totient is φ = 9902443264.

The previous prime is 20512204133. The next prime is 20512204159. The reversal of 20512204136 is 63140221502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20418695236 + 93508900 = 142894^2 + 9670^2 .

It is not an unprimeable number, because it can be changed into a prime (20512204133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44207105 + ... + 44207568.

Almost surely, 2^20512204136 is an apocalyptic number.

It is an amenable number.

20512204136 is a deficient number, since it is larger than the sum of its proper divisors (19274399164).

20512204136 is a wasteful number, since it uses less digits than its factorization.

20512204136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88414708 (or 88414704 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20512204136 its reverse (63140221502), we get a palindrome (83652425638).

The spelling of 20512204136 in words is "twenty billion, five hundred twelve million, two hundred four thousand, one hundred thirty-six".