20400200443 has 4 divisors (see below), whose sum is σ = 23314514800. Its totient is φ = 17485886088.

The previous prime is 20400200419. The next prime is 20400200521. The reversal of 20400200443 is 34400200402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400200443 is a prime.

It is a super-2 number, since 2×20400200443² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400200443.

It is not an unprimeable number, because it can be changed into a prime (20400206443) 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, 1457157168 + ... + 1457157181.

It is an arithmetic number, because the mean of its divisors is an integer number (5828628700).

Almost surely, 2^20400200443 is an apocalyptic number.

20400200443 is a deficient number, since it is larger than the sum of its proper divisors (2914314357).

20400200443 is an equidigital number, since it uses as much as digits as its factorization.

20400200443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914314356.

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20400200443 its reverse (34400200402), we get a palindrome (54800400845).

The spelling of 20400200443 in words is "twenty billion, four hundred million, two hundred thousand, four hundred forty-three".