20972085 has 8 divisors (see below), whose sum is σ = 33555360. Its totient is φ = 11185104.

The previous prime is 20972071. The next prime is 20972087. The reversal of 20972085 is 58027902.

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

It is not a de Polignac number, because 20972085 - 2⁵ = 20972053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699055 + ... + 699084.

It is an arithmetic number, because the mean of its divisors is an integer number (4194420).

Almost surely, 2^20972085 is an apocalyptic number.

It is an amenable number.

20972085 is a deficient number, since it is larger than the sum of its proper divisors (12583275).

20972085 is a wasteful number, since it uses less digits than its factorization.

20972085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398147.

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

The square root of 20972085 is about 4579.5289059029. The cubic root of 20972085 is about 275.7701168147.

Adding to 20972085 its reverse (58027902), we get a palindrome (78999987).

The spelling of 20972085 in words is "twenty million, nine hundred seventy-two thousand, eighty-five".