20201001857 has 2 divisors, whose sum is σ = 20201001858. Its totient is φ = 20201001856.

The previous prime is 20201001833. The next prime is 20201001941. The reversal of 20201001857 is 75810010202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15687312001 + 4513689856 = 125249^2 + 67184^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201001857 - 2¹⁴ = 20200985473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201001817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100500928 + 10100500929.

It is an arithmetic number, because the mean of its divisors is an integer number (10100500929).

Almost surely, 2^20201001857 is an apocalyptic number.

It is an amenable number.

20201001857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201001857 is an equidigital number, since it uses as much as digits as its factorization.

20201001857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The spelling of 20201001857 in words is "twenty billion, two hundred one million, one thousand, eight hundred fifty-seven".