20704031 has 4 divisors (see below), whose sum is σ = 20756064. Its totient is φ = 20652000.

The previous prime is 20704007. The next prime is 20704037. The reversal of 20704031 is 13040702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20704031 - 2⁶ = 20703967 is a prime.

It is a super-2 number, since 2×20704031² = 857313799297922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25415 + ... + 26216.

It is an arithmetic number, because the mean of its divisors is an integer number (5189016).

Almost surely, 2^20704031 is an apocalyptic number.

20704031 is a deficient number, since it is larger than the sum of its proper divisors (52033).

20704031 is an equidigital number, since it uses as much as digits as its factorization.

20704031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52032.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20704031 is about 4550.1682386479. The cubic root of 20704031 is about 274.5901597549.

Adding to 20704031 its reverse (13040702), we get a palindrome (33744733).

The spelling of 20704031 in words is "twenty million, seven hundred four thousand, thirty-one".