20663078 has 4 divisors (see below), whose sum is σ = 30994620. Its totient is φ = 10331538.

The previous prime is 20663053. The next prime is 20663087. The reversal of 20663078 is 87036602.

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

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 as a sum of consecutive naturals, namely, 5165768 + ... + 5165771.

It is an arithmetic number, because the mean of its divisors is an integer number (7748655).

Almost surely, 2^20663078 is an apocalyptic number.

20663078 is a deficient number, since it is larger than the sum of its proper divisors (10331542).

20663078 is a wasteful number, since it uses less digits than its factorization.

20663078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10331541.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20663078 is about 4545.6658478159. The cubic root of 20663078 is about 274.4089919195.

The spelling of 20663078 in words is "twenty million, six hundred sixty-three thousand, seventy-eight".