20206512057 has 8 divisors (see below), whose sum is σ = 26986996800. Its totient is φ = 13448517680.

The previous prime is 20206512047. The next prime is 20206512061. The reversal of 20206512057 is 75021560202.

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

It is a cyclic number.

It is not a de Polignac number, because 20206512057 - 2⁴ = 20206512041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20206512047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5620494 + ... + 5624087.

It is an arithmetic number, because the mean of its divisors is an integer number (3373374600).

Almost surely, 2^20206512057 is an apocalyptic number.

It is an amenable number.

20206512057 is a deficient number, since it is larger than the sum of its proper divisors (6780484743).

20206512057 is a wasteful number, since it uses less digits than its factorization.

20206512057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11245183.

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 20206512057 in words is "twenty billion, two hundred six million, five hundred twelve thousand, fifty-seven".