20835231 has 4 divisors (see below), whose sum is σ = 27780312. Its totient is φ = 13890152.

The previous prime is 20835211. The next prime is 20835233. The reversal of 20835231 is 13253802.

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 20835231 - 2⁷ = 20835103 is a prime.

It is a super-2 number, since 2×20835231² = 868213701646722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835233) 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, 3472536 + ... + 3472541.

It is an arithmetic number, because the mean of its divisors is an integer number (6945078).

Almost surely, 2^20835231 is an apocalyptic number.

20835231 is a deficient number, since it is larger than the sum of its proper divisors (6945081).

20835231 is an equidigital number, since it uses as much as digits as its factorization.

20835231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945080.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20835231 is about 4564.5625201108. The cubic root of 20835231 is about 275.1689584306.

The spelling of 20835231 in words is "twenty million, eight hundred thirty-five thousand, two hundred thirty-one".