20670618 has 16 divisors (see below), whose sum is σ = 41418720. Its totient is φ = 6877296.

The previous prime is 20670577. The next prime is 20670631. The reversal of 20670618 is 81607602.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 588 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (2588670).

Almost surely, 2^20670618 is an apocalyptic number.

20670618 is an abundant number, since it is smaller than the sum of its proper divisors (20748102).

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

20670618 is a wasteful number, since it uses less digits than its factorization.

20670618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20670618 is about 4546.4951336167. The cubic root of 20670618 is about 274.4423653305.

The spelling of 20670618 in words is "twenty million, six hundred seventy thousand, six hundred eighteen".