20493810486081 has 27 divisors (see below), whose sum is σ = 30739703952451. Its totient is φ = 13662295865568.

The previous prime is 20493810486073. The next prime is 20493810486091. The reversal of 20493810486081 is 18068401839402.

It is a happy number.

The square root of 20493810486081 is 4527009.

It is a perfect power (a square), and thus also a powerful number.

20493810486081 is a `hidden beast` number, since 2 + 0 + 4 + 9 + 3 + 81 + 0 + 486 + 0 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18214193660481 + 2279616825600 = 4267809^2 + 1509840^2 .

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 20493810486081 - 2³ = 20493810486073 is a prime.

It is a super-2 number, since 2×20493810486081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493810486091) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 366659785 + ... + 366715673.

Almost surely, 2^{20493810486081} is an apocalyptic number.

20493810486081 is the 4527009-th square number.

20493810486081 is the 2263505-th centered octagonal number.

It is an amenable number.

20493810486081 is a deficient number, since it is larger than the sum of its proper divisors (10245893466370).

20493810486081 is an frugal number, since it uses more digits than its factorization.

20493810486081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111802 (or 55892 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 20493810486081 in words is "twenty trillion, four hundred ninety-three billion, eight hundred ten million, four hundred eighty-six thousand, eighty-one".