20408186143 has 4 divisors (see below), whose sum is σ = 21295498608. Its totient is φ = 19520873680.

The previous prime is 20408186093. The next prime is 20408186171. The reversal of 20408186143 is 34168180402.

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-20408186143 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 (20408186173) 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, 443656198 + ... + 443656243.

It is an arithmetic number, because the mean of its divisors is an integer number (5323874652).

Almost surely, 2^20408186143 is an apocalyptic number.

20408186143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20408186143 is a deficient number, since it is larger than the sum of its proper divisors (887312465).

20408186143 is an equidigital number, since it uses as much as digits as its factorization.

20408186143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887312464.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 20408186143 in words is "twenty billion, four hundred eight million, one hundred eighty-six thousand, one hundred forty-three".