20779997 has 8 divisors (see below), whose sum is σ = 23817600. Its totient is φ = 17759664.

The previous prime is 20779973. The next prime is 20780003. The reversal of 20779997 is 79997702.

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 20779997 - 2¹⁰ = 20778973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (2977200).

Almost surely, 2^20779997 is an apocalyptic number.

It is an amenable number.

20779997 is a deficient number, since it is larger than the sum of its proper divisors (3037603).

20779997 is an equidigital number, since it uses as much as digits as its factorization.

20779997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8635.

The product of its (nonzero) digits is 500094, while the sum is 50.

The square root of 20779997 is about 4558.5081989616. The cubic root of 20779997 is about 274.9255864775.

The spelling of 20779997 in words is "twenty million, seven hundred seventy-nine thousand, nine hundred ninety-seven".