20573574641 has 4 divisors (see below), whose sum is σ = 21783784932. Its totient is φ = 19363364352.

The previous prime is 20573574601. The next prime is 20573574673. The reversal of 20573574641 is 14647537502.

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 19342968241 + 1230606400 = 139079^2 + 35080^2 .

It is a cyclic number.

It is not a de Polignac number, because 20573574641 - 2³⁰ = 19499832817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20573574592 and 20573574601.

It is not an unprimeable number, because it can be changed into a prime (20573574601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605105120 + ... + 605105153.

It is an arithmetic number, because the mean of its divisors is an integer number (5445946233).

Almost surely, 2^20573574641 is an apocalyptic number.

It is an amenable number.

20573574641 is a deficient number, since it is larger than the sum of its proper divisors (1210210291).

20573574641 is a wasteful number, since it uses less digits than its factorization.

20573574641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210210290.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 20573574641 in words is "twenty billion, five hundred seventy-three million, five hundred seventy-four thousand, six hundred forty-one".