20970285 has 48 divisors (see below), whose sum is σ = 39551616. Its totient is φ = 9459072.

The previous prime is 20970253. The next prime is 20970289. The reversal of 20970285 is 58207902.

It is not a de Polignac number, because 20970285 - 2⁵ = 20970253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75567 + ... + 75843.

It is an arithmetic number, because the mean of its divisors is an integer number (823992).

Almost surely, 2^20970285 is an apocalyptic number.

It is an amenable number.

20970285 is a deficient number, since it is larger than the sum of its proper divisors (18581331).

20970285 is a wasteful number, since it uses less digits than its factorization.

20970285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 395 counting only the distinct ones).

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

The square root of 20970285 is about 4579.3323749210. The cubic root of 20970285 is about 275.7622269552.

The spelling of 20970285 in words is "twenty million, nine hundred seventy thousand, two hundred eighty-five".