20779431 has 8 divisors (see below), whose sum is σ = 27753984. Its totient is φ = 13828920.

The previous prime is 20779427. The next prime is 20779441. The reversal of 20779431 is 13497702.

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

It is not a de Polignac number, because 20779431 - 2² = 20779427 is a prime.

It is a super-2 number, since 2×20779431² = 863569505367522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20779392 and 20779401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779411) 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, 3885 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (3469248).

Almost surely, 2^20779431 is an apocalyptic number.

20779431 is a deficient number, since it is larger than the sum of its proper divisors (6974553).

20779431 is a wasteful number, since it uses less digits than its factorization.

20779431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12021.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20779431 is about 4558.4461168253. The cubic root of 20779431 is about 274.9230903383.

The spelling of 20779431 in words is "twenty million, seven hundred seventy-nine thousand, four hundred thirty-one".