20778794 has 16 divisors (see below), whose sum is σ = 33706368. Its totient is φ = 9569472.

The previous prime is 20778787. The next prime is 20778803. The reversal of 20778794 is 49787702.

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 7 ways as a sum of consecutive naturals, for example, 4904 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (2106648).

Almost surely, 2^20778794 is an apocalyptic number.

20778794 is a deficient number, since it is larger than the sum of its proper divisors (12927574).

20778794 is a wasteful number, since it uses less digits than its factorization.

20778794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13069.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 20778794 is about 4558.3762459894. The cubic root of 20778794 is about 274.9202810250.

The spelling of 20778794 in words is "twenty million, seven hundred seventy-eight thousand, seven hundred ninety-four".