20550638 has 8 divisors (see below), whose sum is σ = 32166288. Its totient is φ = 9828544.

The previous prime is 20550617. The next prime is 20550643. The reversal of 20550638 is 83605502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20550638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223331 + ... + 223422.

It is an arithmetic number, because the mean of its divisors is an integer number (4020786).

Almost surely, 2^20550638 is an apocalyptic number.

20550638 is a deficient number, since it is larger than the sum of its proper divisors (11615650).

20550638 is a wasteful number, since it uses less digits than its factorization.

20550638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446778.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20550638 is about 4533.2811516605. The cubic root of 20550638 is about 273.9103459322.

The spelling of 20550638 in words is "twenty million, five hundred fifty thousand, six hundred thirty-eight".