20657184747 has 8 divisors (see below), whose sum is σ = 27595780560. Its totient is φ = 13745022720.

The previous prime is 20657184733. The next prime is 20657184809. The reversal of 20657184747 is 74748175602.

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

It is not a de Polignac number, because 20657184747 - 2⁸ = 20657184491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20657184747.

It is not an unprimeable number, because it can be changed into a prime (20657182747) 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, 6606622 + ... + 6609747.

It is an arithmetic number, because the mean of its divisors is an integer number (3449472570).

Almost surely, 2^20657184747 is an apocalyptic number.

20657184747 is a deficient number, since it is larger than the sum of its proper divisors (6938595813).

20657184747 is a wasteful number, since it uses less digits than its factorization.

20657184747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216893.

The product of its (nonzero) digits is 2634240, while the sum is 51.

The spelling of 20657184747 in words is "twenty billion, six hundred fifty-seven million, one hundred eighty-four thousand, seven hundred forty-seven".