20993078 has 8 divisors (see below), whose sum is σ = 31584072. Its totient is φ = 10465056.

The previous prime is 20993059. The next prime is 20993083. The reversal of 20993078 is 87039902.

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

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, 14900 + ... + 16247.

It is an arithmetic number, because the mean of its divisors is an integer number (3948009).

Almost surely, 2^20993078 is an apocalyptic number.

20993078 is a deficient number, since it is larger than the sum of its proper divisors (10590994).

20993078 is a wasteful number, since it uses less digits than its factorization.

20993078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31486.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20993078 is about 4581.8203805911. The cubic root of 20993078 is about 275.8621011749.

The spelling of 20993078 in words is "twenty million, nine hundred ninety-three thousand, seventy-eight".