20515012 has 24 divisors (see below), whose sum is σ = 41158656. Its totient is φ = 8764608.

The previous prime is 20515009. The next prime is 20515013. The reversal of 20515012 is 21051502.

It is not an unprimeable number, because it can be changed into a prime (20515013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9768 + ... + 11680.

It is an arithmetic number, because the mean of its divisors is an integer number (1714944).

Almost surely, 2^20515012 is an apocalyptic number.

It is an amenable number.

20515012 is an abundant number, since it is smaller than the sum of its proper divisors (20643644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515012 is a wasteful number, since it uses less digits than its factorization.

20515012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307 (or 2305 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20515012 is about 4529.3500637509. The cubic root of 20515012 is about 273.7519733252.

Adding to 20515012 its reverse (21051502), we get a palindrome (41566514).

The spelling of 20515012 in words is "twenty million, five hundred fifteen thousand, twelve".