20128751 has 2 divisors, whose sum is σ = 20128752. Its totient is φ = 20128750.

The previous prime is 20128747. The next prime is 20128763. The reversal of 20128751 is 15782102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20128751 - 2² = 20128747 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20128751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064375 + 10064376.

It is an arithmetic number, because the mean of its divisors is an integer number (10064376).

Almost surely, 2^20128751 is an apocalyptic number.

20128751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128751 is an equidigital number, since it uses as much as digits as its factorization.

20128751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20128751 is about 4486.5076618680. The cubic root of 20128751 is about 272.0229895145.

The spelling of 20128751 in words is "twenty million, one hundred twenty-eight thousand, seven hundred fifty-one".