20016850081 has 4 divisors (see below), whose sum is σ = 20018351664. Its totient is φ = 20015348500.

The previous prime is 20016850079. The next prime is 20016850093. The reversal of 20016850081 is 18005861002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18005861002 = 2 ⋅9002930501.

It is a cyclic number.

It is not a de Polignac number, because 20016850081 - 2¹ = 20016850079 is a prime.

It is a super-2 number, since 2×20016850081² (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 (20016850001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730615 + ... + 757516.

It is an arithmetic number, because the mean of its divisors is an integer number (5004587916).

Almost surely, 2^20016850081 is an apocalyptic number.

It is an amenable number.

20016850081 is a deficient number, since it is larger than the sum of its proper divisors (1501583).

20016850081 is a wasteful number, since it uses less digits than its factorization.

20016850081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501582.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 20016850081 in words is "twenty billion, sixteen million, eight hundred fifty thousand, eighty-one".