20787996 has 12 divisors (see below), whose sum is σ = 48505352. Its totient is φ = 6929328.

The previous prime is 20787971. The next prime is 20788003. The reversal of 20787996 is 69978702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 866155 + ... + 866178.

Almost surely, 2^20787996 is an apocalyptic number.

It is an amenable number.

20787996 is an abundant number, since it is smaller than the sum of its proper divisors (27717356).

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

20787996 is a wasteful number, since it uses less digits than its factorization.

20787996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732340 (or 1732338 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 20787996 is about 4559.3854849091. The cubic root of 20787996 is about 274.9608583409.

The spelling of 20787996 in words is "twenty million, seven hundred eighty-seven thousand, nine hundred ninety-six".