20402403143 has 2 divisors, whose sum is σ = 20402403144. Its totient is φ = 20402403142.

The previous prime is 20402403139. The next prime is 20402403157. The reversal of 20402403143 is 34130420402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20402403143 - 2² = 20402403139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402403173) 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, 10201201571 + 10201201572.

It is an arithmetic number, because the mean of its divisors is an integer number (10201201572).

Almost surely, 2^20402403143 is an apocalyptic number.

20402403143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402403143 is an equidigital number, since it uses as much as digits as its factorization.

20402403143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20402403143 its reverse (34130420402), we get a palindrome (54532823545).

The spelling of 20402403143 in words is "twenty billion, four hundred two million, four hundred three thousand, one hundred forty-three".