20411446216405 has 8 divisors (see below), whose sum is σ = 24493773488184. Its totient is φ = 16329131620800.

The previous prime is 20411446216363. The next prime is 20411446216423. The reversal of 20411446216405 is 50461264411402.

It can be written as a sum of positive squares in 4 ways, for example, as 614090082321 + 19797356134084 = 783639^2 + 4449422^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20411446216405 is a prime.

It is a super-2 number, since 2×20411446216405² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832875 + ... + 6443335.

It is an arithmetic number, because the mean of its divisors is an integer number (3061721686023).

Almost surely, 2^{20411446216405} is an apocalyptic number.

It is an amenable number.

20411446216405 is a deficient number, since it is larger than the sum of its proper divisors (4082327271779).

20411446216405 is an equidigital number, since it uses as much as digits as its factorization.

20411446216405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6338087.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 20411446216405 in words is "twenty trillion, four hundred eleven billion, four hundred forty-six million, two hundred sixteen thousand, four hundred five".