20954087178881 has 8 divisors (see below), whose sum is σ = 21873320634624. Its totient is φ = 20035535905440.

The previous prime is 20954087178851. The next prime is 20954087178887. The reversal of 20954087178881 is 18887178045902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20954087178881 is a prime.

It is a super-2 number, since 2×20954087178881² (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 (20954087178887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170482796 + ... + 170605661.

It is an arithmetic number, because the mean of its divisors is an integer number (2734165079328).

Almost surely, 2^{20954087178881} is an apocalyptic number.

It is an amenable number.

20954087178881 is a deficient number, since it is larger than the sum of its proper divisors (919233455743).

20954087178881 is a wasteful number, since it uses less digits than its factorization.

20954087178881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341091151.

The product of its (nonzero) digits is 72253440, while the sum is 68.

The spelling of 20954087178881 in words is "twenty trillion, nine hundred fifty-four billion, eighty-seven million, one hundred seventy-eight thousand, eight hundred eighty-one".