20572709663 has 4 divisors (see below), whose sum is σ = 22442956008. Its totient is φ = 18702463320.

The previous prime is 20572709657. The next prime is 20572709683. The reversal of 20572709663 is 36690727502.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20572709663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572709653) 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, 935123156 + ... + 935123177.

It is an arithmetic number, because the mean of its divisors is an integer number (5610739002).

Almost surely, 2^20572709663 is an apocalyptic number.

20572709663 is a deficient number, since it is larger than the sum of its proper divisors (1870246345).

20572709663 is a wasteful number, since it uses less digits than its factorization.

20572709663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870246344.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 20572709663 in words is "twenty billion, five hundred seventy-two million, seven hundred nine thousand, six hundred sixty-three".