20870285 has 16 divisors (see below), whose sum is σ = 26749440. Its totient is φ = 15597120.

The previous prime is 20870263. The next prime is 20870293. The reversal of 20870285 is 58207802.

It is not a de Polignac number, because 20870285 - 2¹² = 20866189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2174 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (1671840).

Almost surely, 2^20870285 is an apocalyptic number.

It is an amenable number.

20870285 is a deficient number, since it is larger than the sum of its proper divisors (5879155).

20870285 is a wasteful number, since it uses less digits than its factorization.

20870285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20870285 is about 4568.4007048419. The cubic root of 20870285 is about 275.3231902739.

The spelling of 20870285 in words is "twenty million, eight hundred seventy thousand, two hundred eighty-five".