20555454443 has 16 divisors (see below), whose sum is σ = 22150876896. Its totient is φ = 19003799040.

The previous prime is 20555454433. The next prime is 20555454467. The reversal of 20555454443 is 34445455502.

It is a cyclic number.

It is not a de Polignac number, because 20555454443 - 2⁶ = 20555454379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20555454443.

It is not an unprimeable number, because it can be changed into a prime (20555454433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 788780 + ... + 814422.

It is an arithmetic number, because the mean of its divisors is an integer number (1384429806).

Almost surely, 2^20555454443 is an apocalyptic number.

20555454443 is a deficient number, since it is larger than the sum of its proper divisors (1595422453).

20555454443 is a wasteful number, since it uses less digits than its factorization.

20555454443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26494.

The product of its (nonzero) digits is 960000, while the sum is 41.

The spelling of 20555454443 in words is "twenty billion, five hundred fifty-five million, four hundred fifty-four thousand, four hundred forty-three".