20874587 has 4 divisors (see below), whose sum is σ = 21186216. Its totient is φ = 20562960.

The previous prime is 20874571. The next prime is 20874611. The reversal of 20874587 is 78547802.

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 20874587 - 2⁴ = 20874571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20877587) 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, 155714 + ... + 155847.

It is an arithmetic number, because the mean of its divisors is an integer number (5296554).

Almost surely, 2^20874587 is an apocalyptic number.

20874587 is a deficient number, since it is larger than the sum of its proper divisors (311629).

20874587 is an equidigital number, since it uses as much as digits as its factorization.

20874587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311628.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 20874587 is about 4568.8715236916. The cubic root of 20874587 is about 275.3421064664.

The spelling of 20874587 in words is "twenty million, eight hundred seventy-four thousand, five hundred eighty-seven".