20755789 has 2 divisors, whose sum is σ = 20755790. Its totient is φ = 20755788.

The previous prime is 20755783. The next prime is 20755831. The reversal of 20755789 is 98755702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 126025 = 4542^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 20755789 - 2³ = 20755781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20755781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10377894 + 10377895.

It is an arithmetic number, because the mean of its divisors is an integer number (10377895).

Almost surely, 2^20755789 is an apocalyptic number.

It is an amenable number.

20755789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20755789 is an equidigital number, since it uses as much as digits as its factorization.

20755789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 20755789 is about 4555.8521705604. The cubic root of 20755789 is about 274.8187852957.

The spelling of 20755789 in words is "twenty million, seven hundred fifty-five thousand, seven hundred eighty-nine".