20791618 has 16 divisors (see below), whose sum is σ = 32044320. Its totient is φ = 10112256.

The previous prime is 20791613. The next prime is 20791621. The reversal of 20791618 is 81619702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20791613) 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, 35746 + ... + 36322.

It is an arithmetic number, because the mean of its divisors is an integer number (2002770).

Almost surely, 2^20791618 is an apocalyptic number.

20791618 is a deficient number, since it is larger than the sum of its proper divisors (11252702).

20791618 is a wasteful number, since it uses less digits than its factorization.

20791618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20791618 is about 4559.7826702596. The cubic root of 20791618 is about 274.9768266975.

The spelling of 20791618 in words is "twenty million, seven hundred ninety-one thousand, six hundred eighteen".