20400552543 has 24 divisors (see below), whose sum is σ = 32177986560. Its totient is φ = 11459869680.

The previous prime is 20400552533. The next prime is 20400552563. The reversal of 20400552543 is 34525500402.

It is not a de Polignac number, because 20400552543 - 2⁴ = 20400552527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400552543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400552533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1167423 + ... + 1184768.

It is an arithmetic number, because the mean of its divisors is an integer number (1340749440).

Almost surely, 2^20400552543 is an apocalyptic number.

20400552543 is a deficient number, since it is larger than the sum of its proper divisors (11777434017).

20400552543 is a wasteful number, since it uses less digits than its factorization.

20400552543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352267 (or 2352260 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The spelling of 20400552543 in words is "twenty billion, four hundred million, five hundred fifty-two thousand, five hundred forty-three".