20963546761 has 8 divisors (see below), whose sum is σ = 21320553800. Its totient is φ = 20606970240.

The previous prime is 20963546743. The next prime is 20963546819. The reversal of 20963546761 is 16764536902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4902800400 + 16060746361 = 70020^2 + 126731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20963546761 - 2¹⁵ = 20963513993 is a prime.

It is a super-2 number, since 2×20963546761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20963546561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8646 + ... + 204943.

It is an arithmetic number, because the mean of its divisors is an integer number (2665069225).

Almost surely, 2^20963546761 is an apocalyptic number.

It is an amenable number.

20963546761 is a deficient number, since it is larger than the sum of its proper divisors (357007039).

20963546761 is a wasteful number, since it uses less digits than its factorization.

20963546761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215259.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 20963546761 in words is "twenty billion, nine hundred sixty-three million, five hundred forty-six thousand, seven hundred sixty-one".