20550542 has 4 divisors (see below), whose sum is σ = 30825816. Its totient is φ = 10275270.

The previous prime is 20550529. The next prime is 20550547. The reversal of 20550542 is 24505502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5137634 + ... + 5137637.

It is an arithmetic number, because the mean of its divisors is an integer number (7706454).

Almost surely, 2^20550542 is an apocalyptic number.

20550542 is a deficient number, since it is larger than the sum of its proper divisors (10275274).

20550542 is a wasteful number, since it uses less digits than its factorization.

20550542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275273.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 20550542 is about 4533.2705632909. The cubic root of 20550542 is about 273.9099194177.

The spelling of 20550542 in words is "twenty million, five hundred fifty thousand, five hundred forty-two".