20164451564 has 24 divisors (see below), whose sum is σ = 36518504400. Its totient is φ = 9730857920.

The previous prime is 20164451563. The next prime is 20164451569. The reversal of 20164451564 is 46515446102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20164451563) 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, 286247 + ... + 349665.

It is an arithmetic number, because the mean of its divisors is an integer number (1521604350).

Almost surely, 2^20164451564 is an apocalyptic number.

It is an amenable number.

20164451564 is a deficient number, since it is larger than the sum of its proper divisors (16354052836).

20164451564 is a wasteful number, since it uses less digits than its factorization.

20164451564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66193 (or 66191 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 20164451564 its reverse (46515446102), we get a palindrome (66679897666).

The spelling of 20164451564 in words is "twenty billion, one hundred sixty-four million, four hundred fifty-one thousand, five hundred sixty-four".