20512052578 has 8 divisors (see below), whose sum is σ = 30902437980. Its totient is φ = 10211239920.

The previous prime is 20512052573. The next prime is 20512052581. The reversal of 20512052578 is 87525021502.

It can be written as a sum of positive squares in 2 ways, for example, as 19736597169 + 775455409 = 140487^2 + 27847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20512052573) 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, 22392613 + ... + 22393528.

Almost surely, 2^20512052578 is an apocalyptic number.

20512052578 is a deficient number, since it is larger than the sum of its proper divisors (10390385402).

20512052578 is a wasteful number, since it uses less digits than its factorization.

20512052578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44786372.

The product of its (nonzero) digits is 56000, while the sum is 37.

The spelling of 20512052578 in words is "twenty billion, five hundred twelve million, fifty-two thousand, five hundred seventy-eight".