20554666 has 16 divisors (see below), whose sum is σ = 35614080. Its totient is φ = 8793280.

The previous prime is 20554657. The next prime is 20554669. The reversal of 20554666 is 66645502.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (20554669) 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 in 7 ways as a sum of consecutive naturals, for example, 27106 + ... + 27853.

It is an arithmetic number, because the mean of its divisors is an integer number (2225880).

Almost surely, 2^20554666 is an apocalyptic number.

20554666 is a deficient number, since it is larger than the sum of its proper divisors (15059414).

20554666 is a wasteful number, since it uses less digits than its factorization.

20554666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54989.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 20554666 is about 4533.7253997127. The cubic root of 20554666 is about 273.9282405720.

The spelling of 20554666 in words is "twenty million, five hundred fifty-four thousand, six hundred sixty-six".