20685378 has 32 divisors (see below), whose sum is σ = 47597184. Its totient is φ = 5870592.

The previous prime is 20685377. The next prime is 20685383. The reversal of 20685378 is 87358602.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20685373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5026 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (1487412).

Almost surely, 2^20685378 is an apocalyptic number.

20685378 is an abundant number, since it is smaller than the sum of its proper divisors (26911806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20685378 is a wasteful number, since it uses less digits than its factorization.

20685378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20685378 is about 4548.1180723460. The cubic root of 20685378 is about 274.5076722883.

The spelling of 20685378 in words is "twenty million, six hundred eighty-five thousand, three hundred seventy-eight".