20005543550 has 24 divisors (see below), whose sum is σ = 37218376800. Its totient is φ = 8000482880.

The previous prime is 20005543529. The next prime is 20005543609. The reversal of 20005543550 is 5534550002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203531 + ... + 285369.

It is an arithmetic number, because the mean of its divisors is an integer number (1550765700).

Almost surely, 2^20005543550 is an apocalyptic number.

20005543550 is a deficient number, since it is larger than the sum of its proper divisors (17212833250).

20005543550 is a wasteful number, since it uses less digits than its factorization.

20005543550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86740 (or 86735 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 29.

The spelling of 20005543550 in words is "twenty billion, five million, five hundred forty-three thousand, five hundred fifty".