20332987 has 4 divisors (see below), whose sum is σ = 20469600. Its totient is φ = 20196376.

The previous prime is 20332981. The next prime is 20333009. The reversal of 20332987 is 78923302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20332987 - 2³ = 20332979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20332981) by changing a digit.

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, 68083 + ... + 68380.

It is an arithmetic number, because the mean of its divisors is an integer number (5117400).

Almost surely, 2^20332987 is an apocalyptic number.

20332987 is a deficient number, since it is larger than the sum of its proper divisors (136613).

20332987 is a wasteful number, since it uses less digits than its factorization.

20332987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136612.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20332987 is about 4509.2113501143. The cubic root of 20332987 is about 272.9399206752.

The spelling of 20332987 in words is "twenty million, three hundred thirty-two thousand, nine hundred eighty-seven".