20561013379 has 8 divisors (see below), whose sum is σ = 20678840000. Its totient is φ = 20443233600.

The previous prime is 20561013377. The next prime is 20561013383. The reversal of 20561013379 is 97331016502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20561013379 - 2¹ = 20561013377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20561013377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257247 + ... + 1273495.

It is an arithmetic number, because the mean of its divisors is an integer number (2584855000).

Almost surely, 2^20561013379 is an apocalyptic number.

20561013379 is a deficient number, since it is larger than the sum of its proper divisors (117826621).

20561013379 is a wasteful number, since it uses less digits than its factorization.

20561013379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23421.

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 20561013379 in words is "twenty billion, five hundred sixty-one million, thirteen thousand, three hundred seventy-nine".