20731092 has 48 divisors (see below), whose sum is σ = 51633792. Its totient is φ = 6451200.

The previous prime is 20731091. The next prime is 20731097. The reversal of 20731092 is 29013702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30468 + ... + 31140.

It is an arithmetic number, because the mean of its divisors is an integer number (1075704).

Almost surely, 2^20731092 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 20731092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25816896).

20731092 is an abundant number, since it is smaller than the sum of its proper divisors (30902700).

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

20731092 is a wasteful number, since it uses less digits than its factorization.

20731092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20731092 is about 4553.1408939325. The cubic root of 20731092 is about 274.7097411263.

Adding to 20731092 its reverse (29013702), we get a palindrome (49744794).

The spelling of 20731092 in words is "twenty million, seven hundred thirty-one thousand, ninety-two".