20400314243 has 4 divisors (see below), whose sum is σ = 21058388928. Its totient is φ = 19742239560.

The previous prime is 20400314239. The next prime is 20400314261. The reversal of 20400314243 is 34241300402.

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 20400314243 - 2² = 20400314239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400314203) 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, 329037296 + ... + 329037357.

It is an arithmetic number, because the mean of its divisors is an integer number (5264597232).

Almost surely, 2^20400314243 is an apocalyptic number.

20400314243 is a deficient number, since it is larger than the sum of its proper divisors (658074685).

20400314243 is an equidigital number, since it uses as much as digits as its factorization.

20400314243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658074684.

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

Adding to 20400314243 its reverse (34241300402), we get a palindrome (54641614645).

The spelling of 20400314243 in words is "twenty billion, four hundred million, three hundred fourteen thousand, two hundred forty-three".