20203453 has 4 divisors (see below), whose sum is σ = 21081888. Its totient is φ = 19325020.

The previous prime is 20203427. The next prime is 20203457. The reversal of 20203453 is 35430202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20203453 - 2²¹ = 18106301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20203453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203457) 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, 439183 + ... + 439228.

It is an arithmetic number, because the mean of its divisors is an integer number (5270472).

Almost surely, 2^20203453 is an apocalyptic number.

20203453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20203453 is a deficient number, since it is larger than the sum of its proper divisors (878435).

20203453 is an equidigital number, since it uses as much as digits as its factorization.

20203453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878434.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20203453 is about 4494.8251356421. The cubic root of 20203453 is about 272.3590854632.

Adding to 20203453 its reverse (35430202), we get a palindrome (55633655).

The spelling of 20203453 in words is "twenty million, two hundred three thousand, four hundred fifty-three".