20423131403 has 2 divisors, whose sum is σ = 20423131404. Its totient is φ = 20423131402.

The previous prime is 20423131367. The next prime is 20423131447. The reversal of 20423131403 is 30413132402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20423131403 - 2⁸ = 20423131147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20423121403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211565701 + 10211565702.

It is an arithmetic number, because the mean of its divisors is an integer number (10211565702).

Almost surely, 2^20423131403 is an apocalyptic number.

20423131403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423131403 is an equidigital number, since it uses as much as digits as its factorization.

20423131403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20423131403 its reverse (30413132402), we get a palindrome (50836263805).

Subtracting 20423131403 from its reverse (30413132402), we obtain a palindrome (9990000999).

The spelling of 20423131403 in words is "twenty billion, four hundred twenty-three million, one hundred thirty-one thousand, four hundred three".