20455502545 has 4 divisors (see below), whose sum is σ = 24546603060. Its totient is φ = 16364402032.

The previous prime is 20455502539. The next prime is 20455502563. The reversal of 20455502545 is 54520555402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5826116241 + 14629386304 = 76329^2 + 120952^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455502545 - 2⁹ = 20455502033 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2045550250 + ... + 2045550259.

It is an arithmetic number, because the mean of its divisors is an integer number (6136650765).

Almost surely, 2^20455502545 is an apocalyptic number.

It is an amenable number.

20455502545 is a deficient number, since it is larger than the sum of its proper divisors (4091100515).

20455502545 is an equidigital number, since it uses as much as digits as its factorization.

20455502545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091100514.

The product of its (nonzero) digits is 200000, while the sum is 37.

The spelling of 20455502545 in words is "twenty billion, four hundred fifty-five million, five hundred two thousand, five hundred forty-five".