20388172764 has 24 divisors (see below), whose sum is σ = 47576690560. Its totient is φ = 6795445104.

The previous prime is 20388172747. The next prime is 20388172769. The reversal of 20388172764 is 46727188302.

It is a super-2 number, since 2×20388172764² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388172769) 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, 73977 + ... + 215055.

Almost surely, 2^20388172764 is an apocalyptic number.

It is an amenable number.

20388172764 is an abundant number, since it is smaller than the sum of its proper divisors (27188517796).

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

20388172764 is a wasteful number, since it uses less digits than its factorization.

20388172764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153129 (or 153127 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The spelling of 20388172764 in words is "twenty billion, three hundred eighty-eight million, one hundred seventy-two thousand, seven hundred sixty-four".