20512367681 has 8 divisors (see below), whose sum is σ = 23252886720. Its totient is φ = 17937940752.

The previous prime is 20512367657. The next prime is 20512367693. The reversal of 20512367681 is 18676321502.

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 20512367681 - 2¹⁴ = 20512351297 is a prime.

It is a super-2 number, since 2×20512367681² (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 (20512367641) 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, 41522765 + ... + 41523258.

It is an arithmetic number, because the mean of its divisors is an integer number (2906610840).

Almost surely, 2^20512367681 is an apocalyptic number.

It is an amenable number.

20512367681 is a deficient number, since it is larger than the sum of its proper divisors (2740519039).

20512367681 is a wasteful number, since it uses less digits than its factorization.

20512367681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83046055.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 20512367681 in words is "twenty billion, five hundred twelve million, three hundred sixty-seven thousand, six hundred eighty-one".