20992704 has 56 divisors (see below), whose sum is σ = 57351168. Its totient is φ = 6769920.

The previous prime is 20992693. The next prime is 20992711. The reversal of 20992704 is 40729902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4189 + ... + 7715.

It is an arithmetic number, because the mean of its divisors is an integer number (1024128).

Almost surely, 2^20992704 is an apocalyptic number.

20992704 is a gapful number since it is divisible by the number (24) 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 20992704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28675584).

20992704 is an abundant number, since it is smaller than the sum of its proper divisors (36358464).

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

20992704 is a wasteful number, since it uses less digits than its factorization.

20992704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20992704 is about 4581.7795669368. The cubic root of 20992704 is about 275.8604629677.

The spelling of 20992704 in words is "twenty million, nine hundred ninety-two thousand, seven hundred four".