20712985 has 8 divisors (see below), whose sum is σ = 24995520. Its totient is φ = 16477104.

The previous prime is 20712973. The next prime is 20712997. The reversal of 20712985 is 58921702.

It is an interprime number because it is at equal distance from previous prime (20712973) and next prime (20712997).

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 20712985 - 2⁹ = 20712473 is a prime.

It is a super-2 number, since 2×20712985² = 858055495220450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20712985.

It is an unprimeable number.

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, 10677 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (3124440).

Almost surely, 2^20712985 is an apocalyptic number.

It is an amenable number.

20712985 is a deficient number, since it is larger than the sum of its proper divisors (4282535).

20712985 is a wasteful number, since it uses less digits than its factorization.

20712985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23327.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20712985 is about 4551.1520519534. The cubic root of 20712985 is about 274.6297386165.

The spelling of 20712985 in words is "twenty million, seven hundred twelve thousand, nine hundred eighty-five".