20747664511 has 8 divisors (see below), whose sum is σ = 23714176640. Its totient is φ = 17781792408.

The previous prime is 20747664439. The next prime is 20747664541. The reversal of 20747664511 is 11546674702.

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 20747664511 - 2⁹ = 20747663999 is a prime.

It is a super-2 number, since 2×20747664511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747664541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88401 + ... + 222058.

It is an arithmetic number, because the mean of its divisors is an integer number (2964272080).

Almost surely, 2^20747664511 is an apocalyptic number.

20747664511 is a deficient number, since it is larger than the sum of its proper divisors (2966512129).

20747664511 is an equidigital number, since it uses as much as digits as its factorization.

20747664511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320013.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 20747664511 in words is "twenty billion, seven hundred forty-seven million, six hundred sixty-four thousand, five hundred eleven".