20768618 has 16 divisors (see below), whose sum is σ = 34457640. Its totient is φ = 9326016.

The previous prime is 20768617. The next prime is 20768711. The reversal of 20768618 is 81686702.

It can be written as a sum of positive squares in 4 ways, for example, as 18003049 + 2765569 = 4243^2 + 1663^2 .

It is not an unprimeable number, because it can be changed into a prime (20768617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9833 + ... + 11756.

Almost surely, 2^20768618 is an apocalyptic number.

20768618 is a deficient number, since it is larger than the sum of its proper divisors (13689022).

20768618 is a wasteful number, since it uses less digits than its factorization.

20768618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21641.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20768618 is about 4557.2599223656. The cubic root of 20768618 is about 274.8753947883.

The spelling of 20768618 in words is "twenty million, seven hundred sixty-eight thousand, six hundred eighteen".