20400502243 has 8 divisors (see below), whose sum is σ = 22619931696. Its totient is φ = 18241879200.

The previous prime is 20400502237. The next prime is 20400502403. The reversal of 20400502243 is 34220500402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20400502243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400502643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15200896 + ... + 15202237.

It is an arithmetic number, because the mean of its divisors is an integer number (2827491462).

Almost surely, 2^20400502243 is an apocalyptic number.

20400502243 is a deficient number, since it is larger than the sum of its proper divisors (2219429453).

20400502243 is a wasteful number, since it uses less digits than its factorization.

20400502243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30403205.

The product of its (nonzero) digits is 1920, while the sum is 22.

The spelling of 20400502243 in words is "twenty billion, four hundred million, five hundred two thousand, two hundred forty-three".