20205103453 has 4 divisors (see below), whose sum is σ = 20205437148. Its totient is φ = 20204769760.

The previous prime is 20205103433. The next prime is 20205103487. The reversal of 20205103453 is 35430150202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35430150202 = 2 ⋅17715075101.

It can be written as a sum of positive squares in 2 ways, for example, as 15724407609 + 4480695844 = 125397^2 + 66938^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20205103453 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 (20205103433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47626 + ... + 206587.

It is an arithmetic number, because the mean of its divisors is an integer number (5051359287).

Almost surely, 2^20205103453 is an apocalyptic number.

It is an amenable number.

20205103453 is a deficient number, since it is larger than the sum of its proper divisors (333695).

20205103453 is an equidigital number, since it uses as much as digits as its factorization.

20205103453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333694.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20205103453 its reverse (35430150202), we get a palindrome (55635253655).

The spelling of 20205103453 in words is "twenty billion, two hundred five million, one hundred three thousand, four hundred fifty-three".