20402142311 has 4 divisors (see below), whose sum is σ = 20407843224. Its totient is φ = 20396441400.

The previous prime is 20402142281. The next prime is 20402142331. The reversal of 20402142311 is 11324120402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20402142311 - 2⁶ = 20402142247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402142331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2845085 + ... + 2852246.

It is an arithmetic number, because the mean of its divisors is an integer number (5101960806).

Almost surely, 2^20402142311 is an apocalyptic number.

20402142311 is a deficient number, since it is larger than the sum of its proper divisors (5700913).

20402142311 is an equidigital number, since it uses as much as digits as its factorization.

20402142311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700912.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20402142311 its reverse (11324120402), we get a palindrome (31726262713).

The spelling of 20402142311 in words is "twenty billion, four hundred two million, one hundred forty-two thousand, three hundred eleven".