20641156353 has 6 divisors (see below), whose sum is σ = 29815003634. Its totient is φ = 13760770896.

The previous prime is 20641156337. The next prime is 20641156379. The reversal of 20641156353 is 35365114602.

20641156353 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 1 + 15 + 635 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13102923024 + 7538233329 = 114468^2 + 86823^2 .

It is not a de Polignac number, because 20641156353 - 2⁴ = 20641156337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641152353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1146730900 + ... + 1146730917.

Almost surely, 2^20641156353 is an apocalyptic number.

It is an amenable number.

20641156353 is a deficient number, since it is larger than the sum of its proper divisors (9173847281).

20641156353 is a wasteful number, since it uses less digits than its factorization.

20641156353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293461823 (or 2293461820 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 20641156353 in words is "twenty billion, six hundred forty-one million, one hundred fifty-six thousand, three hundred fifty-three".