20879618 has 8 divisors (see below), whose sum is σ = 32166012. Its totient is φ = 10157616.

The previous prime is 20879611. The next prime is 20879627. The reversal of 20879618 is 81697802.

It can be written as a sum of positive squares in 2 ways, for example, as 14341369 + 6538249 = 3787^2 + 2557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20879611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141005 + ... + 141152.

Almost surely, 2^20879618 is an apocalyptic number.

20879618 is a deficient number, since it is larger than the sum of its proper divisors (11286394).

20879618 is a wasteful number, since it uses less digits than its factorization.

20879618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282196.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 20879618 is about 4569.4220641127. The cubic root of 20879618 is about 275.3642248260.

The spelling of 20879618 in words is "twenty million, eight hundred seventy-nine thousand, six hundred eighteen".