20402440203 has 4 divisors (see below), whose sum is σ = 27203253608. Its totient is φ = 13601626800.

The previous prime is 20402440199. The next prime is 20402440241. The reversal of 20402440203 is 30204420402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20402440203 - 2² = 20402440199 is a prime.

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 20402440203.

It is not an unprimeable number, because it can be changed into a prime (20402440243) 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, 3400406698 + ... + 3400406703.

It is an arithmetic number, because the mean of its divisors is an integer number (6800813402).

Almost surely, 2^20402440203 is an apocalyptic number.

20402440203 is a deficient number, since it is larger than the sum of its proper divisors (6800813405).

20402440203 is an equidigital number, since it uses as much as digits as its factorization.

20402440203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800813404.

The product of its (nonzero) digits is 1536, while the sum is 21.

Adding to 20402440203 its reverse (30204420402), we get a palindrome (50606860605).

The spelling of 20402440203 in words is "twenty billion, four hundred two million, four hundred forty thousand, two hundred three".