20402311534 has 16 divisors (see below), whose sum is σ = 33629296176. Its totient is φ = 9206084800.

The previous prime is 20402311519. The next prime is 20402311537. The reversal of 20402311534 is 43511320402.

It is a junction number, because it is equal to n+sod(n) for n = 20402311499 and 20402311508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402311537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381577 + ... + 3387604.

It is an arithmetic number, because the mean of its divisors is an integer number (2101831011).

Almost surely, 2^20402311534 is an apocalyptic number.

20402311534 is a deficient number, since it is larger than the sum of its proper divisors (13226984642).

20402311534 is a wasteful number, since it uses less digits than its factorization.

20402311534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6769331.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 20402311534 its reverse (43511320402), we get a palindrome (63913631936).

The spelling of 20402311534 in words is "twenty billion, four hundred two million, three hundred eleven thousand, five hundred thirty-four".