20681011377557 has 8 divisors (see below), whose sum is σ = 20709764712000. Its totient is φ = 20652258885984.

The previous prime is 20681011377503. The next prime is 20681011377563. The reversal of 20681011377557 is 75577311018602.

It is a happy number.

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 20681011377557 - 2⁴² = 16282964866453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20681011377499 and 20681011377508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681011377857) 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, 61371794 + ... + 61707852.

It is an arithmetic number, because the mean of its divisors is an integer number (2588720589000).

Almost surely, 2^{20681011377557} is an apocalyptic number.

It is an amenable number.

20681011377557 is a deficient number, since it is larger than the sum of its proper divisors (28753334443).

20681011377557 is an equidigital number, since it uses as much as digits as its factorization.

20681011377557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421435.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 20681011377557 in words is "twenty trillion, six hundred eighty-one billion, eleven million, three hundred seventy-seven thousand, five hundred fifty-seven".