20790231 has 16 divisors (see below), whose sum is σ = 34560768. Its totient is φ = 10800000.

The previous prime is 20790191. The next prime is 20790233. The reversal of 20790231 is 13209702.

It is not a de Polignac number, because 20790231 - 2⁷ = 20790103 is a prime.

It is a super-2 number, since 2×20790231² = 864467410066722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790233) 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 15 ways as a sum of consecutive naturals, for example, 44770 + ... + 45231.

It is an arithmetic number, because the mean of its divisors is an integer number (2160048).

Almost surely, 2^20790231 is an apocalyptic number.

20790231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20790231 is a deficient number, since it is larger than the sum of its proper divisors (13770537).

20790231 is a wasteful number, since it uses less digits than its factorization.

20790231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90022.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20790231 is about 4559.6305771411. The cubic root of 20790231 is about 274.9707120324.

Adding to 20790231 its reverse (13209702), we get a palindrome (33999933).

The spelling of 20790231 in words is "twenty million, seven hundred ninety thousand, two hundred thirty-one".