20147222772 has 72 divisors (see below), whose sum is σ = 53973124800. Its totient is φ = 6499070640.

The previous prime is 20147222729. The next prime is 20147222773. The reversal of 20147222772 is 27722274102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147222773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6729 + ... + 200847.

Almost surely, 2^20147222772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20147222772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26986562400).

20147222772 is an abundant number, since it is smaller than the sum of its proper divisors (33825902028).

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

20147222772 is a wasteful number, since it uses less digits than its factorization.

20147222772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194194 (or 194155 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 36.

Adding to 20147222772 its reverse (27722274102), we get a palindrome (47869496874).

The spelling of 20147222772 in words is "twenty billion, one hundred forty-seven million, two hundred twenty-two thousand, seven hundred seventy-two".