20587147 has 8 divisors (see below), whose sum is σ = 23648000. Its totient is φ = 17556264.

The previous prime is 20587141. The next prime is 20587159. The reversal of 20587147 is 74178502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20587147 - 2⁷ = 20587019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20587141) 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 7 ways as a sum of consecutive naturals, for example, 5997 + ... + 8782.

It is an arithmetic number, because the mean of its divisors is an integer number (2956000).

Almost surely, 2^20587147 is an apocalyptic number.

20587147 is a deficient number, since it is larger than the sum of its proper divisors (3060853).

20587147 is a wasteful number, since it uses less digits than its factorization.

20587147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14985.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 20587147 is about 4537.3061391094. The cubic root of 20587147 is about 274.0724540663.

The spelling of 20587147 in words is "twenty million, five hundred eighty-seven thousand, one hundred forty-seven".