20788667 has 4 divisors (see below), whose sum is σ = 21180960. Its totient is φ = 20396376.

The previous prime is 20788657. The next prime is 20788673. The reversal of 20788667 is 76688702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20788667 - 2¹⁰ = 20787643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20788627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196067 + ... + 196172.

It is an arithmetic number, because the mean of its divisors is an integer number (5295240).

Almost surely, 2^20788667 is an apocalyptic number.

20788667 is a deficient number, since it is larger than the sum of its proper divisors (392293).

20788667 is an equidigital number, since it uses as much as digits as its factorization.

20788667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392292.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 20788667 is about 4559.4590687931. The cubic root of 20788667 is about 274.9638167270.

The spelling of 20788667 in words is "twenty million, seven hundred eighty-eight thousand, six hundred sixty-seven".