20871976319 has 2 divisors, whose sum is σ = 20871976320. Its totient is φ = 20871976318.

The previous prime is 20871976283. The next prime is 20871976337. The reversal of 20871976319 is 91367917802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20871976319 - 2¹² = 20871972223 is a prime.

It is a super-2 number, since 2×20871976319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 10435988159 + 10435988160.

It is an arithmetic number, because the mean of its divisors is an integer number (10435988160).

Almost surely, 2^20871976319 is an apocalyptic number.

20871976319 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871976319 is an equidigital number, since it uses as much as digits as its factorization.

20871976319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 20871976319 in words is "twenty billion, eight hundred seventy-one million, nine hundred seventy-six thousand, three hundred nineteen".