20624406545 has 32 divisors (see below), whose sum is σ = 26762931360. Its totient is φ = 15201894400.

The previous prime is 20624406527. The next prime is 20624406581. The reversal of 20624406545 is 54560442602.

It is a Cunningham number, because it is equal to 143612²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 4291822144 + 16332584401 = 65512^2 + 127799^2 .

It is not a de Polignac number, because 20624406545 - 2⁸ = 20624406289 is a prime.

It is a super-2 number, since 2×20624406545² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20624406499 and 20624406508.

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 31 ways as a sum of consecutive naturals, for example, 750569 + ... + 777561.

It is an arithmetic number, because the mean of its divisors is an integer number (836341605).

Almost surely, 2^20624406545 is an apocalyptic number.

It is an amenable number.

20624406545 is a deficient number, since it is larger than the sum of its proper divisors (6138524815).

20624406545 is a wasteful number, since it uses less digits than its factorization.

20624406545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27205.

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 20624406545 in words is "twenty billion, six hundred twenty-four million, four hundred six thousand, five hundred forty-five".