20455988409 has 6 divisors (see below), whose sum is σ = 29547538826. Its totient is φ = 13637325600.

The previous prime is 20455988401. The next prime is 20455988431. The reversal of 20455988409 is 90488955402.

It is a happy number.

20455988409 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 598 + 8 + 40 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12951578025 + 7504410384 = 113805^2 + 86628^2 .

It is not a de Polignac number, because 20455988409 - 2³ = 20455988401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20455988401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1136443792 + ... + 1136443809.

Almost surely, 2^20455988409 is an apocalyptic number.

It is an amenable number.

20455988409 is a deficient number, since it is larger than the sum of its proper divisors (9091550417).

20455988409 is a wasteful number, since it uses less digits than its factorization.

20455988409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272887607 (or 2272887604 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 20455988409 in words is "twenty billion, four hundred fifty-five million, nine hundred eighty-eight thousand, four hundred nine".