20875015 has 16 divisors (see below), whose sum is σ = 30136320. Its totient is φ = 13560480.

The previous prime is 20875013. The next prime is 20875033. The reversal of 20875015 is 51057802.

It is not a de Polignac number, because 20875015 - 2¹ = 20875013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20875013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15031 + ... + 16360.

It is an arithmetic number, because the mean of its divisors is an integer number (1883520).

Almost surely, 2^20875015 is an apocalyptic number.

20875015 is a deficient number, since it is larger than the sum of its proper divisors (9261305).

20875015 is a wasteful number, since it uses less digits than its factorization.

20875015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31422.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 20875015 is about 4568.9183621509. The cubic root of 20875015 is about 275.3439882700.

The spelling of 20875015 in words is "twenty million, eight hundred seventy-five thousand, fifteen".