20788881 has 8 divisors (see below), whose sum is σ = 27874080. Its totient is φ = 13781472.

The previous prime is 20788877. The next prime is 20788903. The reversal of 20788881 is 18888702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20788881 - 2² = 20788877 is a prime.

It is a super-2 number, since 2×20788881² = 864355146464322, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20788811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18820 + ... + 19893.

It is an arithmetic number, because the mean of its divisors is an integer number (3484260).

Almost surely, 2^20788881 is an apocalyptic number.

It is an amenable number.

20788881 is a deficient number, since it is larger than the sum of its proper divisors (7085199).

20788881 is a wasteful number, since it uses less digits than its factorization.

20788881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38895.

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 20788881 is about 4559.4825364289. The cubic root of 20788881 is about 274.9647602227.

The spelling of 20788881 in words is "twenty million, seven hundred eighty-eight thousand, eight hundred eighty-one".