20404420403 has 2 divisors, whose sum is σ = 20404420404. Its totient is φ = 20404420402.

The previous prime is 20404420369. The next prime is 20404420411. The reversal of 20404420403 is 30402440402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20404420403 - 2²⁰ = 20403371827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404420903) 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 as a sum of consecutive naturals, namely, 10202210201 + 10202210202.

It is an arithmetic number, because the mean of its divisors is an integer number (10202210202).

Almost surely, 2^20404420403 is an apocalyptic number.

20404420403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404420403 is an equidigital number, since it uses as much as digits as its factorization.

20404420403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20404420403 its reverse (30402440402), we get a palindrome (50806860805).

The spelling of 20404420403 in words is "twenty billion, four hundred four million, four hundred twenty thousand, four hundred three".