20590831 has 4 divisors (see below), whose sum is σ = 20627464. Its totient is φ = 20554200.

The previous prime is 20590793. The next prime is 20590849. The reversal of 20590831 is 13809502.

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 20590831 - 2¹¹ = 20588783 is a prime.

It is a super-2 number, since 2×20590831² = 847964642541122, 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 20590831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20590631) 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, 17460 + ... + 18601.

It is an arithmetic number, because the mean of its divisors is an integer number (5156866).

Almost surely, 2^20590831 is an apocalyptic number.

20590831 is a deficient number, since it is larger than the sum of its proper divisors (36633).

20590831 is an equidigital number, since it uses as much as digits as its factorization.

20590831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36632.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20590831 is about 4537.7120887073. The cubic root of 20590831 is about 274.0888012027.

The spelling of 20590831 in words is "twenty million, five hundred ninety thousand, eight hundred thirty-one".