20603044345 has 144 divisors (see below), whose sum is σ = 31174547760. Its totient is φ = 13002522624.

The previous prime is 20603044313. The next prime is 20603044349. The reversal of 20603044345 is 54344030602.

It can be written as a sum of positive squares in 24 ways, for example, as 15379224169 + 5223820176 = 124013^2 + 72276^2 .

It is not a de Polignac number, because 20603044345 - 2⁵ = 20603044313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20603044349) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 150387117 + ... + 150387253.

It is an arithmetic number, because the mean of its divisors is an integer number (216489915).

Almost surely, 2^20603044345 is an apocalyptic number.

It is an amenable number.

20603044345 is a deficient number, since it is larger than the sum of its proper divisors (10571503415).

20603044345 is a wasteful number, since it uses less digits than its factorization.

20603044345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 20603044345 its reverse (54344030602), we get a palindrome (74947074947).

The spelling of 20603044345 in words is "twenty billion, six hundred three million, forty-four thousand, three hundred forty-five".