20887563954843 has 12 divisors (see below), whose sum is σ = 30944574374520. Its totient is φ = 13925026804608.

The previous prime is 20887563954827. The next prime is 20887563954877. The reversal of 20887563954843 is 34845936578802.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

20887563954843 is a `hidden beast` number, since 2 + 0 + 8 + 8 + 7 + 5 + 6 + 39 + 548 + 43 = 666.

It is not a de Polignac number, because 20887563954843 - 2⁴ = 20887563954827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20887563954883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23308155 + ... + 24187707.

It is an arithmetic number, because the mean of its divisors is an integer number (2578714531210).

Almost surely, 2^{20887563954843} is an apocalyptic number.

20887563954843 is a deficient number, since it is larger than the sum of its proper divisors (10057010419677).

20887563954843 is an frugal number, since it uses more digits than its factorization.

20887563954843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759115 (or 879556 counting only the distinct ones).

The product of its (nonzero) digits is 1393459200, while the sum is 72.

The spelling of 20887563954843 in words is "twenty trillion, eight hundred eighty-seven billion, five hundred sixty-three million, nine hundred fifty-four thousand, eight hundred forty-three".