20778814 has 8 divisors (see below), whose sum is σ = 35620848. Its totient is φ = 8905200.

The previous prime is 20778803. The next prime is 20778833. The reversal of 20778814 is 41887702.

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

It is a super-2 number, since 2×20778814² = 863518222493192, which contains 22 as substring.

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, 742087 + ... + 742114.

It is an arithmetic number, because the mean of its divisors is an integer number (4452606).

Almost surely, 2^20778814 is an apocalyptic number.

20778814 is a deficient number, since it is larger than the sum of its proper divisors (14842034).

20778814 is a wasteful number, since it uses less digits than its factorization.

20778814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484210.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 20778814 is about 4558.3784397525. The cubic root of 20778814 is about 274.9203692303.

The spelling of 20778814 in words is "twenty million, seven hundred seventy-eight thousand, eight hundred fourteen".