20428899289 has 2 divisors, whose sum is σ = 20428899290. Its totient is φ = 20428899288.

The previous prime is 20428899263. The next prime is 20428899319. The reversal of 20428899289 is 98299882402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13454144064 + 6974755225 = 115992^2 + 83515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20428899289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20428899259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214449644 + 10214449645.

It is an arithmetic number, because the mean of its divisors is an integer number (10214449645).

Almost surely, 2^20428899289 is an apocalyptic number.

It is an amenable number.

20428899289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428899289 is an equidigital number, since it uses as much as digits as its factorization.

20428899289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 20428899289 in words is "twenty billion, four hundred twenty-eight million, eight hundred ninety-nine thousand, two hundred eighty-nine".