20147618 has 8 divisors (see below), whose sum is σ = 31999212. Its totient is φ = 9481216.

The previous prime is 20147597. The next prime is 20147623. The reversal of 20147618 is 81674102.

It can be written as a sum of positive squares in 2 ways, for example, as 17247409 + 2900209 = 4153^2 + 1703^2 .

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

It is a super-2 number, since 2×20147618² = 811853022147848, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 296255 + ... + 296322.

Almost surely, 2^20147618 is an apocalyptic number.

20147618 is a deficient number, since it is larger than the sum of its proper divisors (11851594).

20147618 is a wasteful number, since it uses less digits than its factorization.

20147618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592596.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20147618 is about 4488.6098070561. The cubic root of 20147618 is about 272.1079534724.

The spelling of 20147618 in words is "twenty million, one hundred forty-seven thousand, six hundred eighteen".