20554261605 has 24 divisors (see below), whose sum is σ = 36385420032. Its totient is φ = 10729031904.

The previous prime is 20554261601. The next prime is 20554261619. The reversal of 20554261605 is 50616245502.

20554261605 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 42 + 6 + 1 + 605 = 666.

It is not a de Polignac number, because 20554261605 - 2² = 20554261601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20554261605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554261601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4857049 + ... + 4861278.

It is an arithmetic number, because the mean of its divisors is an integer number (1516059168).

Almost surely, 2^20554261605 is an apocalyptic number.

It is an amenable number.

20554261605 is a deficient number, since it is larger than the sum of its proper divisors (15831158427).

20554261605 is a wasteful number, since it uses less digits than its factorization.

20554261605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9718385 (or 9718382 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20554261605 in words is "twenty billion, five hundred fifty-four million, two hundred sixty-one thousand, six hundred five".