20538231 has 8 divisors (see below), whose sum is σ = 31296384. Its totient is φ = 11736120.

The previous prime is 20538229. The next prime is 20538239. The reversal of 20538231 is 13283502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20538231 - 2¹ = 20538229 is a prime.

It is a super-2 number, since 2×20538231² = 843637865218722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488985 + ... + 489026.

It is an arithmetic number, because the mean of its divisors is an integer number (3912048).

Almost surely, 2^20538231 is an apocalyptic number.

20538231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20538231 is a deficient number, since it is larger than the sum of its proper divisors (10758153).

20538231 is an equidigital number, since it uses as much as digits as its factorization.

20538231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978021.

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

The square root of 20538231 is about 4531.9125101882. The cubic root of 20538231 is about 273.8552123673.

The spelling of 20538231 in words is "twenty million, five hundred thirty-eight thousand, two hundred thirty-one".