20566992 has 40 divisors (see below), whose sum is σ = 53632480. Its totient is φ = 6791040.

The previous prime is 20566979. The next prime is 20566999. The reversal of 20566992 is 29966502.

It is a self number, because there is not a number n which added to its sum of digits gives 20566992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3267 + ... + 7197.

It is an arithmetic number, because the mean of its divisors is an integer number (1340812).

Almost surely, 2^20566992 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 20566992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26816240).

20566992 is an abundant number, since it is smaller than the sum of its proper divisors (33065488).

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

20566992 is a wasteful number, since it uses less digits than its factorization.

20566992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051 (or 4045 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 20566992 is about 4535.0845637099. The cubic root of 20566992 is about 273.9829850730.

It can be divided in two parts, 205669 and 92, that added together give a triangular number (205761 = T₆₄₁).

The spelling of 20566992 in words is "twenty million, five hundred sixty-six thousand, nine hundred ninety-two".