20046659489 has 2 divisors, whose sum is σ = 20046659490. Its totient is φ = 20046659488.

The previous prime is 20046659473. The next prime is 20046659497. The reversal of 20046659489 is 98495664002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19402261264 + 644398225 = 139292^2 + 25385^2 .

It is a cyclic number.

It is not a de Polignac number, because 20046659489 - 2⁴ = 20046659473 is a prime.

It is a super-2 number, since 2×20046659489² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20046659489.

It is not a weakly prime, because it can be changed into another prime (20046659389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023329744 + 10023329745.

It is an arithmetic number, because the mean of its divisors is an integer number (10023329745).

Almost surely, 2^20046659489 is an apocalyptic number.

It is an amenable number.

20046659489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20046659489 is an equidigital number, since it uses as much as digits as its factorization.

20046659489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 20046659489 in words is "twenty billion, forty-six million, six hundred fifty-nine thousand, four hundred eighty-nine".