20653435181 has 2 divisors, whose sum is σ = 20653435182. Its totient is φ = 20653435180.

The previous prime is 20653435147. The next prime is 20653435193. The reversal of 20653435181 is 18153435602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19784954281 + 868480900 = 140659^2 + 29470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653435181 - 2²⁶ = 20586326317 is a prime.

It is a super-2 number, since 2×20653435181² (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 (20653431181) 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, 10326717590 + 10326717591.

It is an arithmetic number, because the mean of its divisors is an integer number (10326717591).

Almost surely, 2^20653435181 is an apocalyptic number.

It is an amenable number.

20653435181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653435181 is an equidigital number, since it uses as much as digits as its factorization.

20653435181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 20653435181 in words is "twenty billion, six hundred fifty-three million, four hundred thirty-five thousand, one hundred eighty-one".