20826957577 has 4 divisors (see below), whose sum is σ = 20917905220. Its totient is φ = 20736009936.

The previous prime is 20826957523. The next prime is 20826957581. The reversal of 20826957577 is 77575962802.

It is a happy number.

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 18319351801 + 2507605776 = 135349^2 + 50076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20826957577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826157577) 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, 45473478 + ... + 45473935.

It is an arithmetic number, because the mean of its divisors is an integer number (5229476305).

Almost surely, 2^20826957577 is an apocalyptic number.

It is an amenable number.

20826957577 is a deficient number, since it is larger than the sum of its proper divisors (90947643).

20826957577 is an equidigital number, since it uses as much as digits as its factorization.

20826957577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90947642.

The product of its (nonzero) digits is 14817600, while the sum is 58.

The spelling of 20826957577 in words is "twenty billion, eight hundred twenty-six million, nine hundred fifty-seven thousand, five hundred seventy-seven".