20675789 has 2 divisors, whose sum is σ = 20675790. Its totient is φ = 20675788.

The previous prime is 20675779. The next prime is 20675797. The reversal of 20675789 is 98757602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 917764 = 4445^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 20675789 - 2⁸ = 20675533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20675719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337894 + 10337895.

It is an arithmetic number, because the mean of its divisors is an integer number (10337895).

Almost surely, 2^20675789 is an apocalyptic number.

It is an amenable number.

20675789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675789 is an equidigital number, since it uses as much as digits as its factorization.

20675789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 20675789 is about 4547.0637778681. The cubic root of 20675789 is about 274.4652484255.

The spelling of 20675789 in words is "twenty million, six hundred seventy-five thousand, seven hundred eighty-nine".