20405510143 has 6 divisors (see below), whose sum is σ = 20562483752. Its totient is φ = 20249725860.

The previous prime is 20405510131. The next prime is 20405510183. The reversal of 20405510143 is 34101550402.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20405510143 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 (20405510183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577371 + ... + 611692.

Almost surely, 2^20405510143 is an apocalyptic number.

20405510143 is a deficient number, since it is larger than the sum of its proper divisors (156973609).

20405510143 is an equidigital number, since it uses as much as digits as its factorization.

20405510143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189325 (or 1189194 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 20405510143 in words is "twenty billion, four hundred five million, five hundred ten thousand, one hundred forty-three".