20678418 has 24 divisors (see below), whose sum is σ = 45419868. Its totient is φ = 6797952.

The previous prime is 20678417. The next prime is 20678423. The reversal of 20678418 is 81487602.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 1520289 = 4377^2 + 1233^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20678417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6555 + ... + 9182.

Almost surely, 2^20678418 is an apocalyptic number.

20678418 is an abundant number, since it is smaller than the sum of its proper divisors (24741450).

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

20678418 is a wasteful number, since it uses less digits than its factorization.

20678418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15818 (or 15815 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 20678418 is about 4547.3528563330. The cubic root of 20678418 is about 274.4768810095.

The spelling of 20678418 in words is "twenty million, six hundred seventy-eight thousand, four hundred eighteen".