20054859561 has 72 divisors (see below), whose sum is σ = 32267787552. Its totient is φ = 11992780800.

The previous prime is 20054859551. The next prime is 20054859661. The reversal of 20054859561 is 16595845002.

20054859561 is a `hidden beast` number, since 2 + 0 + 0 + 5 + 4 + 85 + 9 + 561 = 666.

It is not a de Polignac number, because 20054859561 - 2⁹ = 20054859049 is a prime.

It is a super-2 number, since 2×20054859561² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20054859521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 36663090 + ... + 36663636.

It is an arithmetic number, because the mean of its divisors is an integer number (448163716).

Almost surely, 2^20054859561 is an apocalyptic number.

It is an amenable number.

20054859561 is a deficient number, since it is larger than the sum of its proper divisors (12212927991).

20054859561 is a wasteful number, since it uses less digits than its factorization.

20054859561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 20054859561 in words is "twenty billion, fifty-four million, eight hundred fifty-nine thousand, five hundred sixty-one".