20456751589 has 2 divisors, whose sum is σ = 20456751590. Its totient is φ = 20456751588.

The previous prime is 20456751533. The next prime is 20456751631. The reversal of 20456751589 is 98515765402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15610503364 + 4846248225 = 124942^2 + 69615^2 .

It is a cyclic number.

It is not a de Polignac number, because 20456751589 - 2⁷ = 20456751461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456758589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228375794 + 10228375795.

It is an arithmetic number, because the mean of its divisors is an integer number (10228375795).

Almost surely, 2^20456751589 is an apocalyptic number.

It is an amenable number.

20456751589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456751589 is an equidigital number, since it uses as much as digits as its factorization.

20456751589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 52.

The spelling of 20456751589 in words is "twenty billion, four hundred fifty-six million, seven hundred fifty-one thousand, five hundred eighty-nine".