20281508131 has 2 divisors, whose sum is σ = 20281508132. Its totient is φ = 20281508130.

The previous prime is 20281508119. The next prime is 20281508189. The reversal of 20281508131 is 13180518202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20281508131 - 2¹¹ = 20281506083 is a prime.

It is a super-2 number, since 2×20281508131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20281508093 and 20281508102.

It is not a weakly prime, because it can be changed into another prime (20281508831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140754065 + 10140754066.

It is an arithmetic number, because the mean of its divisors is an integer number (10140754066).

Almost surely, 2^20281508131 is an apocalyptic number.

20281508131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20281508131 is an equidigital number, since it uses as much as digits as its factorization.

20281508131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 20281508131 in words is "twenty billion, two hundred eighty-one million, five hundred eight thousand, one hundred thirty-one".