20578415794 has 4 divisors (see below), whose sum is σ = 30867623694. Its totient is φ = 10289207896.

The previous prime is 20578415771. The next prime is 20578415797. The reversal of 20578415794 is 49751487502.

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., 15829414225 + 4749001569 = 125815^2 + 68913^2 .

It is not an unprimeable number, because it can be changed into a prime (20578415797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5144603947 + ... + 5144603950.

Almost surely, 2^20578415794 is an apocalyptic number.

20578415794 is a deficient number, since it is larger than the sum of its proper divisors (10289207900).

20578415794 is a wasteful number, since it uses less digits than its factorization.

20578415794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10289207899.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 20578415794 in words is "twenty billion, five hundred seventy-eight million, four hundred fifteen thousand, seven hundred ninety-four".