20556426332641 has 8 divisors (see below), whose sum is σ = 20863326291104. Its totient is φ = 20249528951520.

The previous prime is 20556426332593. The next prime is 20556426332647. The reversal of 20556426332641 is 14623362465502.

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 20556426332641 - 2¹⁹ = 20556425808353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556426332647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20631226 + ... + 21604636.

It is an arithmetic number, because the mean of its divisors is an integer number (2607915786388).

Almost surely, 2^{20556426332641} is an apocalyptic number.

It is an amenable number.

20556426332641 is a deficient number, since it is larger than the sum of its proper divisors (306899958463).

20556426332641 is an equidigital number, since it uses as much as digits as its factorization.

20556426332641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288671.

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 20556426332641 in words is "twenty trillion, five hundred fifty-six billion, four hundred twenty-six million, three hundred thirty-two thousand, six hundred forty-one".