20200565681 has 8 divisors (see below), whose sum is σ = 20853863424. Its totient is φ = 19547372160.

The previous prime is 20200565587. The next prime is 20200565717. The reversal of 20200565681 is 18656500202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200565681 is a prime.

It is a super-2 number, since 2×20200565681² (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 (20200565381) 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, 632216 + ... + 663398.

It is an arithmetic number, because the mean of its divisors is an integer number (2606732928).

Almost surely, 2^20200565681 is an apocalyptic number.

It is an amenable number.

20200565681 is a deficient number, since it is larger than the sum of its proper divisors (653297743).

20200565681 is a wasteful number, since it uses less digits than its factorization.

20200565681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52111.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 20200565681 in words is "twenty billion, two hundred million, five hundred sixty-five thousand, six hundred eighty-one".