20787795 has 24 divisors (see below), whose sum is σ = 41180256. Its totient is φ = 9502848.

The previous prime is 20787761. The next prime is 20787803. The reversal of 20787795 is 59778702.

It is not a de Polignac number, because 20787795 - 2⁶ = 20787731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20787795.

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 23 ways as a sum of consecutive naturals, for example, 32682 + ... + 33311.

It is an arithmetic number, because the mean of its divisors is an integer number (1715844).

Almost surely, 2^20787795 is an apocalyptic number.

20787795 is a deficient number, since it is larger than the sum of its proper divisors (20392461).

20787795 is a wasteful number, since it uses less digits than its factorization.

20787795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66011 (or 66008 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 20787795 is about 4559.3634424117. The cubic root of 20787795 is about 274.9599721354.

The spelling of 20787795 in words is "twenty million, seven hundred eighty-seven thousand, seven hundred ninety-five".