20665567011 has 8 divisors (see below), whose sum is σ = 28504230480. Its totient is φ = 13301974112.

The previous prime is 20665567009. The next prime is 20665567031. The reversal of 20665567011 is 11076556602.

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 20665567011 - 2¹ = 20665567009 is a prime.

It is a super-2 number, since 2×20665567011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20665567001) 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, 118767540 + ... + 118767713.

It is an arithmetic number, because the mean of its divisors is an integer number (3563028810).

Almost surely, 2^20665567011 is an apocalyptic number.

20665567011 is a deficient number, since it is larger than the sum of its proper divisors (7838663469).

20665567011 is a wasteful number, since it uses less digits than its factorization.

20665567011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237535285.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20665567011 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, eleven".