20857676537 has 2 divisors, whose sum is σ = 20857676538. Its totient is φ = 20857676536.

The previous prime is 20857676527. The next prime is 20857676561. The reversal of 20857676537 is 73567675802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20730528361 + 127148176 = 143981^2 + 11276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20857676537 - 2⁶ = 20857676473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20857676527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428838268 + 10428838269.

It is an arithmetic number, because the mean of its divisors is an integer number (10428838269).

Almost surely, 2^20857676537 is an apocalyptic number.

It is an amenable number.

20857676537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20857676537 is an equidigital number, since it uses as much as digits as its factorization.

20857676537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 20857676537 in words is "twenty billion, eight hundred fifty-seven million, six hundred seventy-six thousand, five hundred thirty-seven".