20432687 has 4 divisors (see below), whose sum is σ = 22290216. Its totient is φ = 18575160.

The previous prime is 20432683. The next prime is 20432701. The reversal of 20432687 is 78623402.

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 20432687 - 2² = 20432683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928748 + ... + 928769.

It is an arithmetic number, because the mean of its divisors is an integer number (5572554).

Almost surely, 2^20432687 is an apocalyptic number.

20432687 is a deficient number, since it is larger than the sum of its proper divisors (1857529).

20432687 is a wasteful number, since it uses less digits than its factorization.

20432687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857528.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20432687 is about 4520.2529796462. The cubic root of 20432687 is about 273.3853012763.

The spelling of 20432687 in words is "twenty million, four hundred thirty-two thousand, six hundred eighty-seven".