20731173120 has 432 divisors, whose sum is σ = 84629056512. Its totient is φ = 4585144320.

The previous prime is 20731173059. The next prime is 20731173121. The reversal of 20731173120 is 2137113702.

It is not an unprimeable number, because it can be changed into a prime (20731173121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2495694 + ... + 2503986.

Almost surely, 2^20731173120 is an apocalyptic number.

20731173120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20731173120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42314528256).

20731173120 is an abundant number, since it is smaller than the sum of its proper divisors (63897883392).

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

20731173120 is a wasteful number, since it uses less digits than its factorization.

20731173120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8358 (or 8341 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

Adding to 20731173120 its reverse (2137113702), we get a palindrome (22868286822).

The spelling of 20731173120 in words is "twenty billion, seven hundred thirty-one million, one hundred seventy-three thousand, one hundred twenty".