20400244003 has 2 divisors, whose sum is σ = 20400244004. Its totient is φ = 20400244002.

The previous prime is 20400243991. The next prime is 20400244019. The reversal of 20400244003 is 30044200402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400244003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20400244303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200122001 + 10200122002.

It is an arithmetic number, because the mean of its divisors is an integer number (10200122002).

Almost surely, 2^20400244003 is an apocalyptic number.

20400244003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400244003 is an equidigital number, since it uses as much as digits as its factorization.

20400244003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20400244003 its reverse (30044200402), we get a palindrome (50444444405).

The spelling of 20400244003 in words is "twenty billion, four hundred million, two hundred forty-four thousand, three".