20372546545 has 16 divisors (see below), whose sum is σ = 27235449360. Its totient is φ = 14525570304.

The previous prime is 20372546543. The next prime is 20372546561. The reversal of 20372546545 is 54564527302.

It can be written as a sum of positive squares in 8 ways, for example, as 4626312289 + 15746234256 = 68017^2 + 125484^2 .

It is a cyclic number.

It is not a de Polignac number, because 20372546545 - 2¹ = 20372546543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20372546543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5401974 + ... + 5405743.

It is an arithmetic number, because the mean of its divisors is an integer number (1702215585).

Almost surely, 2^20372546545 is an apocalyptic number.

It is an amenable number.

20372546545 is a deficient number, since it is larger than the sum of its proper divisors (6862902815).

20372546545 is a wasteful number, since it uses less digits than its factorization.

20372546545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10807764.

The product of its (nonzero) digits is 1008000, while the sum is 43.

The spelling of 20372546545 in words is "twenty billion, three hundred seventy-two million, five hundred forty-six thousand, five hundred forty-five".