20281508189 has 2 divisors, whose sum is σ = 20281508190. Its totient is φ = 20281508188.

The previous prime is 20281508131. The next prime is 20281508267. The reversal of 20281508189 is 98180518202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17655765625 + 2625742564 = 132875^2 + 51242^2 .

It is a cyclic number.

It is not a de Polignac number, because 20281508189 - 2³² = 15986540893 is a prime.

It is a super-2 number, since 2×20281508189² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20281508119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140754094 + 10140754095.

It is an arithmetic number, because the mean of its divisors is an integer number (10140754095).

Almost surely, 2^20281508189 is an apocalyptic number.

It is an amenable number.

20281508189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20281508189 is an equidigital number, since it uses as much as digits as its factorization.

20281508189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 20281508189 in words is "twenty billion, two hundred eighty-one million, five hundred eight thousand, one hundred eighty-nine".