20453351 has 4 divisors (see below), whose sum is σ = 20462400. Its totient is φ = 20444304.

The previous prime is 20453327. The next prime is 20453401. The reversal of 20453351 is 15335402.

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 a de Polignac number, because none of the positive numbers 2^k-20453351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453311) 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, 2090 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (5115600).

Almost surely, 2^20453351 is an apocalyptic number.

20453351 is a deficient number, since it is larger than the sum of its proper divisors (9049).

20453351 is an equidigital number, since it uses as much as digits as its factorization.

20453351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9048.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20453351 is about 4522.5381148200. The cubic root of 20453351 is about 273.4774303004.

Adding to 20453351 its reverse (15335402), we get a palindrome (35788753).

The spelling of 20453351 in words is "twenty million, four hundred fifty-three thousand, three hundred fifty-one".