20788887 has 32 divisors (see below), whose sum is σ = 32832000. Its totient is φ = 11694144.

The previous prime is 20788877. The next prime is 20788903. The reversal of 20788887 is 78888702.

It is not a de Polignac number, because 20788887 - 2¹⁰ = 20787863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20788837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91468 + ... + 91694.

It is an arithmetic number, because the mean of its divisors is an integer number (1026000).

Almost surely, 2^20788887 is an apocalyptic number.

20788887 is a deficient number, since it is larger than the sum of its proper divisors (12043113).

20788887 is an equidigital number, since it uses as much as digits as its factorization.

20788887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The square root of 20788887 is about 4559.4831943982. The cubic root of 20788887 is about 274.9647866758.

The spelling of 20788887 in words is "twenty million, seven hundred eighty-eight thousand, eight hundred eighty-seven".