20985681141 has 24 divisors (see below), whose sum is σ = 30477584280. Its totient is φ = 13914464256.

The previous prime is 20985681113. The next prime is 20985681169. The reversal of 20985681141 is 14118658902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20985681113) and next prime (20985681169).

It can be written as a sum of positive squares in 4 ways, for example, as 12582108900 + 8403572241 = 112170^2 + 91671^2 .

It is not a de Polignac number, because 20985681141 - 2⁶ = 20985681077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985685141) 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 in 23 ways as a sum of consecutive naturals, for example, 2124085 + ... + 2133941.

It is an arithmetic number, because the mean of its divisors is an integer number (1269899345).

Almost surely, 2^20985681141 is an apocalyptic number.

It is an amenable number.

20985681141 is a deficient number, since it is larger than the sum of its proper divisors (9491903139).

20985681141 is a wasteful number, since it uses less digits than its factorization.

20985681141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11125 (or 11122 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 20985681141 in words is "twenty billion, nine hundred eighty-five million, six hundred eighty-one thousand, one hundred forty-one".