20216586761 has 4 divisors (see below), whose sum is σ = 23104670592. Its totient is φ = 17328502932.

The previous prime is 20216586707. The next prime is 20216586763. The reversal of 20216586761 is 16768561202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20216586761 - 2¹⁴ = 20216570377 is a prime.

It is a super-2 number, since 2×20216586761² (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 (20216586763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444041905 + ... + 1444041918.

It is an arithmetic number, because the mean of its divisors is an integer number (5776167648).

Almost surely, 2^20216586761 is an apocalyptic number.

It is an amenable number.

20216586761 is a deficient number, since it is larger than the sum of its proper divisors (2888083831).

20216586761 is an equidigital number, since it uses as much as digits as its factorization.

20216586761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888083830.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 20216586761 in words is "twenty billion, two hundred sixteen million, five hundred eighty-six thousand, seven hundred sixty-one".