20788039 has 2 divisors, whose sum is σ = 20788040. Its totient is φ = 20788038.

The previous prime is 20788037. The next prime is 20788063. The reversal of 20788039 is 93088702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20788039 - 2¹ = 20788037 is a prime.

Together with 20788037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20787989 and 20788007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20788037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394019 + 10394020.

It is an arithmetic number, because the mean of its divisors is an integer number (10394020).

Almost surely, 2^20788039 is an apocalyptic number.

20788039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20788039 is an equidigital number, since it uses as much as digits as its factorization.

20788039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20788039 is about 4559.3902004544. The cubic root of 20788039 is about 274.9610479265.

The spelling of 20788039 in words is "twenty million, seven hundred eighty-eight thousand, thirty-nine".