20402254043 has 2 divisors, whose sum is σ = 20402254044. Its totient is φ = 20402254042.

The previous prime is 20402254009. The next prime is 20402254063. The reversal of 20402254043 is 34045220402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402254043 - 2²⁰ = 20401205467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402254063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201127021 + 10201127022.

It is an arithmetic number, because the mean of its divisors is an integer number (10201127022).

Almost surely, 2^20402254043 is an apocalyptic number.

20402254043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402254043 is an equidigital number, since it uses as much as digits as its factorization.

20402254043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 20402254043 its reverse (34045220402), we get a palindrome (54447474445).

The spelling of 20402254043 in words is "twenty billion, four hundred two million, two hundred fifty-four thousand, forty-three".