20702985 has 8 divisors (see below), whose sum is σ = 33124800. Its totient is φ = 11041584.

The previous prime is 20702971. The next prime is 20702987. The reversal of 20702985 is 58920702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20702985 - 2¹⁵ = 20670217 is a prime.

It is a super-2 number, since 2×20702985² = 857227175820450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20702987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690085 + ... + 690114.

It is an arithmetic number, because the mean of its divisors is an integer number (4140600).

Almost surely, 2^20702985 is an apocalyptic number.

It is an amenable number.

20702985 is a deficient number, since it is larger than the sum of its proper divisors (12421815).

20702985 is a wasteful number, since it uses less digits than its factorization.

20702985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380207.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20702985 is about 4550.0532963912. The cubic root of 20702985 is about 274.5855354357.

The spelling of 20702985 in words is "twenty million, seven hundred two thousand, nine hundred eighty-five".