20759978 has 8 divisors (see below), whose sum is σ = 31180800. Its totient is φ = 10366380.

The previous prime is 20759957. The next prime is 20760001. The reversal of 20759978 is 87995702.

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

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 3 ways as a sum of consecutive naturals, for example, 4778 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (3897600).

Almost surely, 2^20759978 is an apocalyptic number.

20759978 is a deficient number, since it is larger than the sum of its proper divisors (10420822).

20759978 is a wasteful number, since it uses less digits than its factorization.

20759978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13612.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 20759978 is about 4556.3118857251. The cubic root of 20759978 is about 274.8372723220.

The spelling of 20759978 in words is "twenty million, seven hundred fifty-nine thousand, nine hundred seventy-eight".