20453231 has 4 divisors (see below), whose sum is σ = 20506200. Its totient is φ = 20400264.

The previous prime is 20453203. The next prime is 20453269. The reversal of 20453231 is 13235402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13235402 = 2 ⋅6617701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20453231 is a prime.

It is a super-2 number, since 2×20453231² = 836669316678722, 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 (20453201) 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, 25901 + ... + 26678.

It is an arithmetic number, because the mean of its divisors is an integer number (5126550).

Almost surely, 2^20453231 is an apocalyptic number.

20453231 is a deficient number, since it is larger than the sum of its proper divisors (52969).

20453231 is an equidigital number, since it uses as much as digits as its factorization.

20453231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52968.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20453231 is about 4522.5248479140. The cubic root of 20453231 is about 273.4768954678.

Adding to 20453231 its reverse (13235402), we get a palindrome (33688633).

It can be divided in two parts, 204 and 53231, that added together give a palindrome (53435).

The spelling of 20453231 in words is "twenty million, four hundred fifty-three thousand, two hundred thirty-one".