20216125164 has 12 divisors (see below), whose sum is σ = 47170958744. Its totient is φ = 6738708384.

The previous prime is 20216125141. The next prime is 20216125169. The reversal of 20216125164 is 46152161202.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20216125169) 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, 842338537 + ... + 842338560.

Almost surely, 2^20216125164 is an apocalyptic number.

It is an amenable number.

20216125164 is an abundant number, since it is smaller than the sum of its proper divisors (26954833580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20216125164 is a wasteful number, since it uses less digits than its factorization.

20216125164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684677104 (or 1684677102 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 20216125164 its reverse (46152161202), we get a palindrome (66368286366).

The spelling of 20216125164 in words is "twenty billion, two hundred sixteen million, one hundred twenty-five thousand, one hundred sixty-four".