20858335523 has 4 divisors (see below), whose sum is σ = 21531185088. Its totient is φ = 20185485960.

The previous prime is 20858335507. The next prime is 20858335529. The reversal of 20858335523 is 32553385802.

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

It is a cyclic number.

It is not a de Polignac number, because 20858335523 - 2⁴ = 20858335507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20858335529) 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, 336424736 + ... + 336424797.

It is an arithmetic number, because the mean of its divisors is an integer number (5382796272).

Almost surely, 2^20858335523 is an apocalyptic number.

20858335523 is a deficient number, since it is larger than the sum of its proper divisors (672849565).

20858335523 is an equidigital number, since it uses as much as digits as its factorization.

20858335523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672849564.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 20858335523 in words is "twenty billion, eight hundred fifty-eight million, three hundred thirty-five thousand, five hundred twenty-three".