20871458651 has 2 divisors, whose sum is σ = 20871458652. Its totient is φ = 20871458650.

The previous prime is 20871458593. The next prime is 20871458653. The reversal of 20871458651 is 15685417802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20871458651 - 2¹⁰ = 20871457627 is a prime.

It is a Sophie Germain prime.

Together with 20871458653, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20871458596 and 20871458605.

It is not a weakly prime, because it can be changed into another prime (20871458653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435729325 + 10435729326.

It is an arithmetic number, because the mean of its divisors is an integer number (10435729326).

Almost surely, 2^20871458651 is an apocalyptic number.

20871458651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871458651 is an equidigital number, since it uses as much as digits as its factorization.

20871458651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 20871458651 in words is "twenty billion, eight hundred seventy-one million, four hundred fifty-eight thousand, six hundred fifty-one".