20376566149681 has 9 divisors (see below), whose sum is σ = 23703389217081. Its totient is φ = 17465601044052.

The previous prime is 20376566149669. The next prime is 20376566149697. The reversal of 20376566149681 is 18694166567302.

The square root of 20376566149681 is 4514041.

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

It is not a de Polignac number, because 20376566149681 - 2¹¹ = 20376566147633 is a prime.

It is a super-2 number, since 2×20376566149681² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20376566149481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31275856 + ... + 31920718.

It is an arithmetic number, because the mean of its divisors is an integer number (2633709913009).

It is a 1-persistent number, because it is pandigital, but 2⋅20376566149681 = 40753132299362 is not.

Almost surely, 2^{20376566149681} is an apocalyptic number.

20376566149681 is the 4514041-st square number.

20376566149681 is the 2257021-st centered octagonal number.

It is an amenable number.

20376566149681 is a deficient number, since it is larger than the sum of its proper divisors (3326823067400).

20376566149681 is an frugal number, since it uses more digits than its factorization.

20376566149681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289740 (or 644870 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 20376566149681 in words is "twenty trillion, three hundred seventy-six billion, five hundred sixty-six million, one hundred forty-nine thousand, six hundred eighty-one".