20788651 has 8 divisors (see below), whose sum is σ = 22909040. Its totient is φ = 18742752.

The previous prime is 20788633. The next prime is 20788657. The reversal of 20788651 is 15688702.

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 20788651 - 2²³ = 12400043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20788651.

It is not an unprimeable number, because it can be changed into a prime (20788657) 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, 18036 + ... + 19153.

It is an arithmetic number, because the mean of its divisors is an integer number (2863630).

Almost surely, 2^20788651 is an apocalyptic number.

20788651 is a deficient number, since it is larger than the sum of its proper divisors (2120389).

20788651 is a wasteful number, since it uses less digits than its factorization.

20788651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37245.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 20788651 is about 4559.4573141987. The cubic root of 20788651 is about 274.9637461850.

The spelling of 20788651 in words is "twenty million, seven hundred eighty-eight thousand, six hundred fifty-one".