20748254689 has 2 divisors, whose sum is σ = 20748254690. Its totient is φ = 20748254688.

The previous prime is 20748254677. The next prime is 20748254731. The reversal of 20748254689 is 98645284702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20225675089 + 522579600 = 142217^2 + 22860^2 .

It is a cyclic number.

It is not a de Polignac number, because 20748254689 - 2¹⁹ = 20747730401 is a prime.

It is a super-2 number, since 2×20748254689² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20748254629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374127344 + 10374127345.

It is an arithmetic number, because the mean of its divisors is an integer number (10374127345).

Almost surely, 2^20748254689 is an apocalyptic number.

It is an amenable number.

20748254689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20748254689 is an equidigital number, since it uses as much as digits as its factorization.

20748254689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 20748254689 in words is "twenty billion, seven hundred forty-eight million, two hundred fifty-four thousand, six hundred eighty-nine".