20402213243 has 4 divisors (see below), whose sum is σ = 21476013960. Its totient is φ = 19328412528.

The previous prime is 20402213219. The next prime is 20402213257. The reversal of 20402213243 is 34231220402.

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 20402213243 - 2¹⁸ = 20401951099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402215243) 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 3 ways as a sum of consecutive naturals, for example, 536900330 + ... + 536900367.

It is an arithmetic number, because the mean of its divisors is an integer number (5369003490).

Almost surely, 2^20402213243 is an apocalyptic number.

20402213243 is a deficient number, since it is larger than the sum of its proper divisors (1073800717).

20402213243 is a wasteful number, since it uses less digits than its factorization.

20402213243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073800716.

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

Adding to 20402213243 its reverse (34231220402), we get a palindrome (54633433645).

The spelling of 20402213243 in words is "twenty billion, four hundred two million, two hundred thirteen thousand, two hundred forty-three".