20789031 has 4 divisors (see below), whose sum is σ = 27718712. Its totient is φ = 13859352.

The previous prime is 20789029. The next prime is 20789039. The reversal of 20789031 is 13098702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20789031 - 2¹ = 20789029 is a prime.

It is a super-2 number, since 2×20789031² = 864367619837922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20789031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20789039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3464836 + ... + 3464841.

It is an arithmetic number, because the mean of its divisors is an integer number (6929678).

Almost surely, 2^20789031 is an apocalyptic number.

20789031 is a deficient number, since it is larger than the sum of its proper divisors (6929681).

20789031 is an equidigital number, since it uses as much as digits as its factorization.

20789031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929680.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20789031 is about 4559.4989856343. The cubic root of 20789031 is about 274.9654215476.

The spelling of 20789031 in words is "twenty million, seven hundred eighty-nine thousand, thirty-one".