20678628 has 12 divisors (see below), whose sum is σ = 48250160. Its totient is φ = 6892872.

The previous prime is 20678591. The next prime is 20678629. The reversal of 20678628 is 82687602.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20678629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861598 + ... + 861621.

Almost surely, 2^20678628 is an apocalyptic number.

It is an amenable number.

20678628 is an abundant number, since it is smaller than the sum of its proper divisors (27571532).

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

20678628 is a wasteful number, since it uses less digits than its factorization.

20678628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723226 (or 1723224 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 20678628 is about 4547.3759466312. The cubic root of 20678628 is about 274.4778101578.

The spelling of 20678628 in words is "twenty million, six hundred seventy-eight thousand, six hundred twenty-eight".