20791992 has 64 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6325632.

The previous prime is 20791987. The next prime is 20791993. The reversal of 20791992 is 29919702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 20791992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791993) 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, 31813 + ... + 32459.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^20791992 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 20791992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

20791992 is an abundant number, since it is smaller than the sum of its proper divisors (35817288).

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

20791992 is a wasteful number, since it uses less digits than its factorization.

20791992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 20791992 is about 4559.8236808017. The cubic root of 20791992 is about 274.9784754503.

The spelling of 20791992 in words is "twenty million, seven hundred ninety-one thousand, nine hundred ninety-two".