20877251573 has 2 divisors, whose sum is σ = 20877251574. Its totient is φ = 20877251572.

The previous prime is 20877251543. The next prime is 20877251579. The reversal of 20877251573 is 37515277802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17102623729 + 3774627844 = 130777^2 + 61438^2 .

It is a cyclic number.

It is not a de Polignac number, because 20877251573 - 2²⁶ = 20810142709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20877251579) 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 as a sum of consecutive naturals, namely, 10438625786 + 10438625787.

It is an arithmetic number, because the mean of its divisors is an integer number (10438625787).

Almost surely, 2^20877251573 is an apocalyptic number.

It is an amenable number.

20877251573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877251573 is an equidigital number, since it uses as much as digits as its factorization.

20877251573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 823200, while the sum is 47.

The spelling of 20877251573 in words is "twenty billion, eight hundred seventy-seven million, two hundred fifty-one thousand, five hundred seventy-three".