20788907 has 6 divisors (see below), whose sum is σ = 21941028. Its totient is φ = 19694412.

The previous prime is 20788903. The next prime is 20788913. The reversal of 20788907 is 70988702.

It is not a de Polignac number, because 20788907 - 2² = 20788903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20788903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28433 + ... + 29154.

It is an arithmetic number, because the mean of its divisors is an integer number (3656838).

Almost surely, 2^20788907 is an apocalyptic number.

20788907 is a deficient number, since it is larger than the sum of its proper divisors (1152121).

20788907 is an equidigital number, since it uses as much as digits as its factorization.

20788907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57625 (or 57606 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 20788907 is about 4559.4853876287. The cubic root of 20788907 is about 274.9648748526.

The spelling of 20788907 in words is "twenty million, seven hundred eighty-eight thousand, nine hundred seven".