20871976337 has 2 divisors, whose sum is σ = 20871976338. Its totient is φ = 20871976336.

The previous prime is 20871976319. The next prime is 20871976339. The reversal of 20871976337 is 73367917802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16889861521 + 3982114816 = 129961^2 + 63104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20871976337 - 2³⁰ = 19798234513 is a prime.

Together with 20871976339, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20871976339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435988168 + 10435988169.

It is an arithmetic number, because the mean of its divisors is an integer number (10435988169).

Almost surely, 2^20871976337 is an apocalyptic number.

It is an amenable number.

20871976337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871976337 is an equidigital number, since it uses as much as digits as its factorization.

20871976337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 20871976337 in words is "twenty billion, eight hundred seventy-one million, nine hundred seventy-six thousand, three hundred thirty-seven".