20786378 has 8 divisors (see below), whose sum is σ = 32022372. Its totient is φ = 10112256.

The previous prime is 20786377. The next prime is 20786407. The reversal of 20786378 is 87368702.

It can be written as a sum of positive squares in 2 ways, for example, as 17783089 + 3003289 = 4217^2 + 1733^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20786377) by changing a digit.

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, 140375 + ... + 140522.

Almost surely, 2^20786378 is an apocalyptic number.

20786378 is a deficient number, since it is larger than the sum of its proper divisors (11235994).

20786378 is a wasteful number, since it uses less digits than its factorization.

20786378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280936.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20786378 is about 4559.2080452640. The cubic root of 20786378 is about 274.9537244448.

The spelling of 20786378 in words is "twenty million, seven hundred eighty-six thousand, three hundred seventy-eight".