20515285 has 16 divisors (see below), whose sum is σ = 28252800. Its totient is φ = 14008896.

The previous prime is 20515283. The next prime is 20515291. The reversal of 20515285 is 58251502.

It is a cyclic number.

It is not a de Polignac number, because 20515285 - 2¹ = 20515283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8326 + ... + 10504.

It is an arithmetic number, because the mean of its divisors is an integer number (1765800).

Almost surely, 2^20515285 is an apocalyptic number.

It is an amenable number.

20515285 is a deficient number, since it is larger than the sum of its proper divisors (7737515).

20515285 is a wasteful number, since it uses less digits than its factorization.

20515285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 20515285 is about 4529.3802004248. The cubic root of 20515285 is about 273.7531876223.

Adding to 20515285 its reverse (58251502), we get a palindrome (78766787).

The spelling of 20515285 in words is "twenty million, five hundred fifteen thousand, two hundred eighty-five".