20939574523 has 8 divisors (see below), whose sum is σ = 23994087680. Its totient is φ = 17900847720.

The previous prime is 20939574503. The next prime is 20939574527. The reversal of 20939574523 is 32547593902.

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

It is not a de Polignac number, because 20939574523 - 2²¹ = 20937477371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939574527) 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, 3943743 + ... + 3949048.

It is an arithmetic number, because the mean of its divisors is an integer number (2999260960).

Almost surely, 2^20939574523 is an apocalyptic number.

20939574523 is a deficient number, since it is larger than the sum of its proper divisors (3054513157).

20939574523 is an equidigital number, since it uses as much as digits as its factorization.

20939574523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893177.

The product of its (nonzero) digits is 2041200, while the sum is 49.

The spelling of 20939574523 in words is "twenty billion, nine hundred thirty-nine million, five hundred seventy-four thousand, five hundred twenty-three".