20712587 has 4 divisors (see below), whose sum is σ = 23671536. Its totient is φ = 17753640.

The previous prime is 20712577. The next prime is 20712589. The reversal of 20712587 is 78521702.

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 20712587 - 2⁸ = 20712331 is a prime.

It is a super-2 number, since 2×20712587² = 858022520465138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20712589) 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 3 ways as a sum of consecutive naturals, for example, 1479464 + ... + 1479477.

It is an arithmetic number, because the mean of its divisors is an integer number (5917884).

Almost surely, 2^20712587 is an apocalyptic number.

20712587 is a deficient number, since it is larger than the sum of its proper divisors (2958949).

20712587 is an equidigital number, since it uses as much as digits as its factorization.

20712587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958948.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 20712587 is about 4551.1083265508. The cubic root of 20712587 is about 274.6279796018.

The spelling of 20712587 in words is "twenty million, seven hundred twelve thousand, five hundred eighty-seven".