20851792 has 40 divisors (see below), whose sum is σ = 46075176. Its totient is φ = 9056256.

The previous prime is 20851781. The next prime is 20851801. The reversal of 20851792 is 29715802.

It can be written as a sum of positive squares in 4 ways, for example, as 6533136 + 14318656 = 2556^2 + 3784^2 .

It is a super-2 number, since 2×20851792² = 869594459222528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588 + ... + 6484.

Almost surely, 2^20851792 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 20851792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23037588).

20851792 is an abundant number, since it is smaller than the sum of its proper divisors (25223384).

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

20851792 is a wasteful number, since it uses less digits than its factorization.

20851792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5935 (or 5929 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20851792 is about 4566.3762438065. The cubic root of 20851792 is about 275.2418456514.

The spelling of 20851792 in words is "twenty million, eight hundred fifty-one thousand, seven hundred ninety-two".