20634775161 has 64 divisors (see below), whose sum is σ = 37155041280. Its totient is φ = 9837354240.

The previous prime is 20634775127. The next prime is 20634775171. The reversal of 20634775161 is 16157743602.

It is a happy number.

It is not a de Polignac number, because 20634775161 - 2⁶ = 20634775097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20634775171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 499660 + ... + 539378.

It is an arithmetic number, because the mean of its divisors is an integer number (580547520).

Almost surely, 2^20634775161 is an apocalyptic number.

20634775161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20634775161 is a deficient number, since it is larger than the sum of its proper divisors (16520266119).

20634775161 is a wasteful number, since it uses less digits than its factorization.

20634775161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39926.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 20634775161 in words is "twenty billion, six hundred thirty-four million, seven hundred seventy-five thousand, one hundred sixty-one".