20992769 has 8 divisors (see below), whose sum is σ = 24024768. Its totient is φ = 17969040.

The previous prime is 20992757. The next prime is 20992771. The reversal of 20992769 is 96729902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20992769 - 2⁸ = 20992513 is a prime.

It is a super-2 number, since 2×20992769² = 881392700574722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20992789) by changing a digit.

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, 4994 + ... + 8180.

It is an arithmetic number, because the mean of its divisors is an integer number (3003096).

Almost surely, 2^20992769 is an apocalyptic number.

It is an amenable number.

20992769 is a deficient number, since it is larger than the sum of its proper divisors (3031999).

20992769 is an equidigital number, since it uses as much as digits as its factorization.

20992769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 20992769 is about 4581.7866602451. The cubic root of 20992769 is about 275.8607476842.

The spelling of 20992769 in words is "twenty million, nine hundred ninety-two thousand, seven hundred sixty-nine".