20155020681 has 8 divisors (see below), whose sum is σ = 28041768000. Its totient is φ = 12852476912.

The previous prime is 20155020661. The next prime is 20155020707. The reversal of 20155020681 is 18602055102.

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

It is not a de Polignac number, because 20155020681 - 2⁵ = 20155020649 is a prime.

It is a super-2 number, since 2×20155020681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20155020661) 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, 146050806 + ... + 146050943.

It is an arithmetic number, because the mean of its divisors is an integer number (3505221000).

Almost surely, 2^20155020681 is an apocalyptic number.

It is an amenable number.

20155020681 is a deficient number, since it is larger than the sum of its proper divisors (7886747319).

20155020681 is a wasteful number, since it uses less digits than its factorization.

20155020681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292101775.

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 20155020681 its reverse (18602055102), we get a palindrome (38757075783).

The spelling of 20155020681 in words is "twenty billion, one hundred fifty-five million, twenty thousand, six hundred eighty-one".