20515996 has 6 divisors (see below), whose sum is σ = 35903000. Its totient is φ = 10257996.

The previous prime is 20515967. The next prime is 20516009. The reversal of 20515996 is 69951502.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2564496 + ... + 2564503.

Almost surely, 2^20515996 is an apocalyptic number.

It is an amenable number.

20515996 is a deficient number, since it is larger than the sum of its proper divisors (15387004).

20515996 is a wasteful number, since it uses less digits than its factorization.

20515996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129003 (or 5129001 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 20515996 is about 4529.4586873047. The cubic root of 20515996 is about 273.7563500817.

The spelling of 20515996 in words is "twenty million, five hundred fifteen thousand, nine hundred ninety-six".