20659031 has 4 divisors (see below), whose sum is σ = 20668200. Its totient is φ = 20649864.

The previous prime is 20659021. The next prime is 20659087. The reversal of 20659031 is 13095602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20659031 - 2¹⁴ = 20642647 is a prime.

It is a super-2 number, since 2×20659031² = 853591123717922, 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 (20659021) 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, 1400 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (5167050).

Almost surely, 2^20659031 is an apocalyptic number.

20659031 is a deficient number, since it is larger than the sum of its proper divisors (9169).

20659031 is an equidigital number, since it uses as much as digits as its factorization.

20659031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9168.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20659031 is about 4545.2206767109. The cubic root of 20659031 is about 274.3910758133.

The spelling of 20659031 in words is "twenty million, six hundred fifty-nine thousand, thirty-one".