20378931577573 has 16 divisors (see below), whose sum is σ = 21654871144560. Its totient is φ = 19141375680000.

The previous prime is 20378931577567. The next prime is 20378931577603. The reversal of 20378931577573 is 37577513987302.

It can be written as a sum of positive squares in 8 ways, for example, as 5991612241729 + 14387319335844 = 2447777^2 + 3793062^2 .

It is a cyclic number.

It is not a de Polignac number, because 20378931577573 - 2²⁹ = 20378394706661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20378931577499 and 20378931577508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378931577373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5253873 + ... + 8268073.

It is an arithmetic number, because the mean of its divisors is an integer number (1353429446535).

Almost surely, 2^{20378931577573} is an apocalyptic number.

It is an amenable number.

20378931577573 is a deficient number, since it is larger than the sum of its proper divisors (1275939566987).

20378931577573 is a wasteful number, since it uses less digits than its factorization.

20378931577573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020568.

The product of its (nonzero) digits is 233377200, while the sum is 67.

The spelling of 20378931577573 in words is "twenty trillion, three hundred seventy-eight billion, nine hundred thirty-one million, five hundred seventy-seven thousand, five hundred seventy-three".