20787793 has 8 divisors (see below), whose sum is σ = 22459136. Its totient is φ = 19126800.

The previous prime is 20787761. The next prime is 20787803. The reversal of 20787793 is 39778702.

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

It is a cyclic number.

It is not a de Polignac number, because 20787793 - 2⁵ = 20787761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20787743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (2807392).

Almost surely, 2^20787793 is an apocalyptic number.

It is an amenable number.

20787793 is a deficient number, since it is larger than the sum of its proper divisors (1671343).

20787793 is a wasteful number, since it uses less digits than its factorization.

20787793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 20787793 is about 4559.3632230828. The cubic root of 20787793 is about 274.9599633174.

The spelling of 20787793 in words is "twenty million, seven hundred eighty-seven thousand, seven hundred ninety-three".