20621442536413 has 8 divisors (see below), whose sum is σ = 20635413537920. Its totient is φ = 20607476250240.

The previous prime is 20621442536407. The next prime is 20621442536417. The reversal of 20621442536413 is 31463524412602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20621442536413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20621442536413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621442536417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7592758 + ... + 9944488.

It is an arithmetic number, because the mean of its divisors is an integer number (2579426692240).

Almost surely, 2^{20621442536413} is an apocalyptic number.

It is an amenable number.

20621442536413 is a deficient number, since it is larger than the sum of its proper divisors (13971001507).

20621442536413 is a wasteful number, since it uses less digits than its factorization.

20621442536413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357667.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 20621442536413 in words is "twenty trillion, six hundred twenty-one billion, four hundred forty-two million, five hundred thirty-six thousand, four hundred thirteen".