20890778 has 8 divisors (see below), whose sum is σ = 31404672. Its totient is φ = 10422556.

The previous prime is 20890763. The next prime is 20890781. The reversal of 20890778 is 87709802.

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, 10250 + ... + 12117.

It is an arithmetic number, because the mean of its divisors is an integer number (3925584).

Almost surely, 2^20890778 is an apocalyptic number.

20890778 is a deficient number, since it is larger than the sum of its proper divisors (10513894).

20890778 is a wasteful number, since it uses less digits than its factorization.

20890778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22836.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 20890778 is about 4570.6430619772. The cubic root of 20890778 is about 275.4132761290.

The spelling of 20890778 in words is "twenty million, eight hundred ninety thousand, seven hundred seventy-eight".