20788751 has 2 divisors, whose sum is σ = 20788752. Its totient is φ = 20788750.

The previous prime is 20788741. The next prime is 20788753. The reversal of 20788751 is 15788702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20788751 - 2⁶ = 20788687 is a prime.

Together with 20788753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20788753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394375 + 10394376.

It is an arithmetic number, because the mean of its divisors is an integer number (10394376).

Almost surely, 2^20788751 is an apocalyptic number.

20788751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20788751 is an equidigital number, since it uses as much as digits as its factorization.

20788751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 20788751 is about 4559.4682804029. The cubic root of 20788751 is about 274.9641870719.

The spelling of 20788751 in words is "twenty million, seven hundred eighty-eight thousand, seven hundred fifty-one".