20004964781481 has 27 divisors (see below), whose sum is σ = 29060117005413. Its totient is φ = 13261349907360.

The previous prime is 20004964781449. The next prime is 20004964781489. The reversal of 20004964781481 is 18418746940002.

The square root of 20004964781481 is 4472691.

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

20004964781481 is a `hidden beast` number, since 2 + 0 + 0 + 0 + 4 + 96 + 4 + 78 + 1 + 481 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5381866413225 + 14623098368256 = 2319885^2 + 3824016^2 .

It is not a de Polignac number, because 20004964781481 - 2⁵ = 20004964781449 is a prime.

It is a super-2 number, since 2×20004964781481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20004964781489) 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, 2428667095 + ... + 2428675331.

Almost surely, 2^{20004964781481} is an apocalyptic number.

20004964781481 is the 4472691-st square number.

20004964781481 is the 2236346-th centered octagonal number.

It is an amenable number.

20004964781481 is a deficient number, since it is larger than the sum of its proper divisors (9055152223932).

20004964781481 is an frugal number, since it uses more digits than its factorization.

20004964781481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16842 (or 8421 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 20004964781481 in words is "twenty trillion, four billion, nine hundred sixty-four million, seven hundred eighty-one thousand, four hundred eighty-one".