20555542 has 16 divisors (see below), whose sum is σ = 36375552. Its totient is φ = 8525160.

The previous prime is 20555527. The next prime is 20555551. The reversal of 20555542 is 24555502.

It is a self number, because there is not a number n which added to its sum of digits gives 20555542.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 23248 + ... + 24115.

It is an arithmetic number, because the mean of its divisors is an integer number (2273472).

Almost surely, 2^20555542 is an apocalyptic number.

20555542 is a deficient number, since it is larger than the sum of its proper divisors (15820010).

20555542 is a wasteful number, since it uses less digits than its factorization.

20555542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47403.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 20555542 is about 4533.8220079752. The cubic root of 20555542 is about 273.9321319468.

The spelling of 20555542 in words is "twenty million, five hundred fifty-five thousand, five hundred forty-two".