20523305164 has 18 divisors (see below), whose sum is σ = 37808389220. Its totient is φ = 9720974016.

The previous prime is 20523305119. The next prime is 20523305177. The reversal of 20523305164 is 46150332502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1240692 + ... + 1257124.

Almost surely, 2^20523305164 is an apocalyptic number.

It is an amenable number.

20523305164 is a deficient number, since it is larger than the sum of its proper divisors (17285084056).

20523305164 is an frugal number, since it uses more digits than its factorization.

20523305164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32889 (or 16454 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 20523305164 its reverse (46150332502), we get a palindrome (66673637666).

The spelling of 20523305164 in words is "twenty billion, five hundred twenty-three million, three hundred five thousand, one hundred sixty-four".