20297231 has 4 divisors (see below), whose sum is σ = 20402592. Its totient is φ = 20191872.

The previous prime is 20297213. The next prime is 20297243. The reversal of 20297231 is 13279202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13279202 = 2 ⋅6639601.

It is a cyclic number.

It is not a de Polignac number, because 20297231 - 2¹⁰ = 20296207 is a prime.

It is a super-2 number, since 2×20297231² = 823955172534722, 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 20297231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297131) 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, 52391 + ... + 52776.

It is an arithmetic number, because the mean of its divisors is an integer number (5100648).

Almost surely, 2^20297231 is an apocalyptic number.

20297231 is a deficient number, since it is larger than the sum of its proper divisors (105361).

20297231 is a wasteful number, since it uses less digits than its factorization.

20297231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105360.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20297231 is about 4505.2448324148. The cubic root of 20297231 is about 272.7798365386.

The spelling of 20297231 in words is "twenty million, two hundred ninety-seven thousand, two hundred thirty-one".