20857713451 has 2 divisors, whose sum is σ = 20857713452. Its totient is φ = 20857713450.

The previous prime is 20857713449. The next prime is 20857713493. The reversal of 20857713451 is 15431775802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20857713451 - 2¹ = 20857713449 is a prime.

Together with 20857713449, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20857713398 and 20857713407.

It is not a weakly prime, because it can be changed into another prime (20857713551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428856725 + 10428856726.

It is an arithmetic number, because the mean of its divisors is an integer number (10428856726).

Almost surely, 2^20857713451 is an apocalyptic number.

20857713451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20857713451 is an equidigital number, since it uses as much as digits as its factorization.

20857713451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 20857713451 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirteen thousand, four hundred fifty-one".