20402001323 has 16 divisors (see below), whose sum is σ = 23073672960. Its totient is φ = 17869236000.

The previous prime is 20402001311. The next prime is 20402001331. The reversal of 20402001323 is 32310020402.

It is not a de Polignac number, because 20402001323 - 2⁴ = 20402001307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402501323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80498 + ... + 217448.

It is an arithmetic number, because the mean of its divisors is an integer number (1442104560).

Almost surely, 2^20402001323 is an apocalyptic number.

20402001323 is a deficient number, since it is larger than the sum of its proper divisors (2671671637).

20402001323 is a wasteful number, since it uses less digits than its factorization.

20402001323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137458.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20402001323 its reverse (32310020402), we get a palindrome (52712021725).

The spelling of 20402001323 in words is "twenty billion, four hundred two million, one thousand, three hundred twenty-three".