20401617103577 has 4 divisors (see below), whose sum is σ = 20409137053620. Its totient is φ = 20394097153536.

The previous prime is 20401617103559. The next prime is 20401617103603. The reversal of 20401617103577 is 77530171610402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15301522064656 + 5100095038921 = 3911716^2 + 2258339^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401617103577 - 2⁶ = 20401617103513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401617103877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3759970952 + ... + 3759976377.

It is an arithmetic number, because the mean of its divisors is an integer number (5102284263405).

Almost surely, 2^{20401617103577} is an apocalyptic number.

It is an amenable number.

20401617103577 is a deficient number, since it is larger than the sum of its proper divisors (7519950043).

20401617103577 is an equidigital number, since it uses as much as digits as its factorization.

20401617103577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7519950042.

The product of its (nonzero) digits is 246960, while the sum is 44.

Adding to 20401617103577 its reverse (77530171610402), we get a palindrome (97931788713979).

The spelling of 20401617103577 in words is "twenty trillion, four hundred one billion, six hundred seventeen million, one hundred three thousand, five hundred seventy-seven".