20450772136 has 16 divisors (see below), whose sum is σ = 39236947200. Its totient is φ = 9987586224.

The previous prime is 20450772061. The next prime is 20450772143. The reversal of 20450772136 is 63127705402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20450772095 and 20450772104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29724616 + ... + 29725303.

It is an arithmetic number, because the mean of its divisors is an integer number (2452309200).

Almost surely, 2^20450772136 is an apocalyptic number.

It is an amenable number.

20450772136 is a deficient number, since it is larger than the sum of its proper divisors (18786175064).

20450772136 is a wasteful number, since it uses less digits than its factorization.

20450772136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59449968 (or 59449964 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 20450772136 in words is "twenty billion, four hundred fifty million, seven hundred seventy-two thousand, one hundred thirty-six".