20299097857 has 2 divisors, whose sum is σ = 20299097858. Its totient is φ = 20299097856.

The previous prime is 20299097851. The next prime is 20299097881. The reversal of 20299097857 is 75879099202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17309086096 + 2990011761 = 131564^2 + 54681^2 .

It is a cyclic number.

It is not a de Polignac number, because 20299097857 - 2¹⁹ = 20298573569 is a prime.

It is not a weakly prime, because it can be changed into another prime (20299097851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10149548928 + 10149548929.

It is an arithmetic number, because the mean of its divisors is an integer number (10149548929).

Almost surely, 2^20299097857 is an apocalyptic number.

It is an amenable number.

20299097857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20299097857 is an equidigital number, since it uses as much as digits as its factorization.

20299097857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The spelling of 20299097857 in words is "twenty billion, two hundred ninety-nine million, ninety-seven thousand, eight hundred fifty-seven".