20787936 has 48 divisors (see below), whose sum is σ = 58769424. Its totient is φ = 6395904.

The previous prime is 20787917. The next prime is 20787941. The reversal of 20787936 is 63978702.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7081 + ... + 9576.

It is an arithmetic number, because the mean of its divisors is an integer number (1224363).

Almost surely, 2^20787936 is an apocalyptic number.

20787936 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20787936 is an abundant number, since it is smaller than the sum of its proper divisors (37981488).

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

20787936 is a wasteful number, since it uses less digits than its factorization.

20787936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16683 (or 16675 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20787936 is about 4559.3789050703. The cubic root of 20787936 is about 274.9605938026.

The spelling of 20787936 in words is "twenty million, seven hundred eighty-seven thousand, nine hundred thirty-six".