20124750857 has 2 divisors, whose sum is σ = 20124750858. Its totient is φ = 20124750856.

The previous prime is 20124750853. The next prime is 20124750917. The reversal of 20124750857 is 75805742102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20067838921 + 56911936 = 141661^2 + 7544^2 .

It is a cyclic number.

It is not a de Polignac number, because 20124750857 - 2² = 20124750853 is a prime.

It is not a weakly prime, because it can be changed into another prime (20124750853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062375428 + 10062375429.

It is an arithmetic number, because the mean of its divisors is an integer number (10062375429).

Almost surely, 2^20124750857 is an apocalyptic number.

It is an amenable number.

20124750857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124750857 is an equidigital number, since it uses as much as digits as its factorization.

20124750857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156800, while the sum is 41.

The spelling of 20124750857 in words is "twenty billion, one hundred twenty-four million, seven hundred fifty thousand, eight hundred fifty-seven".