20005815761481 has 32 divisors (see below), whose sum is σ = 29344116358656. Its totient is φ = 12022901280000.

The previous prime is 20005815761447. The next prime is 20005815761507. The reversal of 20005815761481 is 18416751850002.

It is not a de Polignac number, because 20005815761481 - 2⁷ = 20005815761353 is a prime.

It is a super-2 number, since 2×20005815761481² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20005815761481.

It is not an unprimeable number, because it can be changed into a prime (20005815761081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3822906 + ... + 7390956.

It is an arithmetic number, because the mean of its divisors is an integer number (917003636208).

Almost surely, 2^{20005815761481} is an apocalyptic number.

It is an amenable number.

20005815761481 is a deficient number, since it is larger than the sum of its proper divisors (9338300597175).

20005815761481 is a wasteful number, since it uses less digits than its factorization.

20005815761481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569493.

The product of its (nonzero) digits is 537600, while the sum is 48.

The spelling of 20005815761481 in words is "twenty trillion, five billion, eight hundred fifteen million, seven hundred sixty-one thousand, four hundred eighty-one".