20628814489 has 2 divisors, whose sum is σ = 20628814490. Its totient is φ = 20628814488.

The previous prime is 20628814477. The next prime is 20628814519. The reversal of 20628814489 is 98441882602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20296846089 + 331968400 = 142467^2 + 18220^2 .

It is a cyclic number.

It is not a de Polignac number, because 20628814489 - 2⁷ = 20628814361 is a prime.

It is a super-2 number, since 2×20628814489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20628814429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314407244 + 10314407245.

It is an arithmetic number, because the mean of its divisors is an integer number (10314407245).

Almost surely, 2^20628814489 is an apocalyptic number.

It is an amenable number.

20628814489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628814489 is an equidigital number, since it uses as much as digits as its factorization.

20628814489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1769472, while the sum is 52.

The spelling of 20628814489 in words is "twenty billion, six hundred twenty-eight million, eight hundred fourteen thousand, four hundred eighty-nine".