20516012 has 12 divisors (see below), whose sum is σ = 39167016. Its totient is φ = 9325440.

The previous prime is 20516009. The next prime is 20516039. The reversal of 20516012 is 21061502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233093 + ... + 233180.

It is an arithmetic number, because the mean of its divisors is an integer number (3263918).

Almost surely, 2^20516012 is an apocalyptic number.

20516012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20516012 is a deficient number, since it is larger than the sum of its proper divisors (18651004).

20516012 is a wasteful number, since it uses less digits than its factorization.

20516012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466288 (or 466286 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20516012 is about 4529.4604535198. The cubic root of 20516012 is about 273.7564212473.

Adding to 20516012 its reverse (21061502), we get a palindrome (41577514).

Subtracting 20516012 from its reverse (21061502), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 20516012 in words is "twenty million, five hundred sixteen thousand, twelve".