20401858670591 has 8 divisors (see below), whose sum is σ = 20902499612064. Its totient is φ = 19907142474240.

The previous prime is 20401858670563. The next prime is 20401858670593. The reversal of 20401858670591 is 19507685810402.

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 20401858670591 - 2¹⁴ = 20401858654207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401858670593) 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, 1481179310 + ... + 1481193083.

It is an arithmetic number, because the mean of its divisors is an integer number (2612812451508).

Almost surely, 2^{20401858670591} is an apocalyptic number.

20401858670591 is a deficient number, since it is larger than the sum of its proper divisors (500640941473).

20401858670591 is an equidigital number, since it uses as much as digits as its factorization.

20401858670591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2962372561.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 20401858670591 in words is "twenty trillion, four hundred one billion, eight hundred fifty-eight million, six hundred seventy thousand, five hundred ninety-one".