20895903945 has 24 divisors (see below), whose sum is σ = 41393791296. Its totient is φ = 9552413088.

The previous prime is 20895903937. The next prime is 20895903971. The reversal of 20895903945 is 54930959802.

It is a happy number.

20895903945 is a `hidden beast` number, since 2 + 0 + 8 + 9 + 590 + 3 + 9 + 45 = 666.

It is not a de Polignac number, because 20895903945 - 2³ = 20895903937 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20895903891 and 20895903900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33167787 + ... + 33168416.

It is an arithmetic number, because the mean of its divisors is an integer number (1724741304).

Almost surely, 2^20895903945 is an apocalyptic number.

It is an amenable number.

20895903945 is a deficient number, since it is larger than the sum of its proper divisors (20497887351).

20895903945 is a wasteful number, since it uses less digits than its factorization.

20895903945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66336221 (or 66336218 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 20895903945 in words is "twenty billion, eight hundred ninety-five million, nine hundred three thousand, nine hundred forty-five".