20149230778 has 4 divisors (see below), whose sum is σ = 30223846170. Its totient is φ = 10074615388.

The previous prime is 20149230743. The next prime is 20149230781. The reversal of 20149230778 is 87703294102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19032133849 + 1117096929 = 137957^2 + 33423^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5037307693 + ... + 5037307696.

Almost surely, 2^20149230778 is an apocalyptic number.

20149230778 is a deficient number, since it is larger than the sum of its proper divisors (10074615392).

20149230778 is a wasteful number, since it uses less digits than its factorization.

20149230778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10074615391.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 20149230778 in words is "twenty billion, one hundred forty-nine million, two hundred thirty thousand, seven hundred seventy-eight".