20603044361 has 4 divisors (see below), whose sum is σ = 20603469972. Its totient is φ = 20602618752.

The previous prime is 20603044349. The next prime is 20603044477. The reversal of 20603044361 is 16344030602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16344030602 = 2 ⋅8172015301.

It can be written as a sum of positive squares in 2 ways, for example, as 13180188025 + 7422856336 = 114805^2 + 86156^2 .

It is a cyclic number.

It is not a de Polignac number, because 20603044361 - 2¹⁰ = 20603043337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20603040361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129260 + ... + 240653.

It is an arithmetic number, because the mean of its divisors is an integer number (5150867493).

Almost surely, 2^20603044361 is an apocalyptic number.

It is an amenable number.

20603044361 is a deficient number, since it is larger than the sum of its proper divisors (425611).

20603044361 is an equidigital number, since it uses as much as digits as its factorization.

20603044361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425610.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 20603044361 its reverse (16344030602), we get a palindrome (36947074963).

The spelling of 20603044361 in words is "twenty billion, six hundred three million, forty-four thousand, three hundred sixty-one".