20155097 has 2 divisors, whose sum is σ = 20155098. Its totient is φ = 20155096.

The previous prime is 20155073. The next prime is 20155117. The reversal of 20155097 is 79055102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20106256 + 48841 = 4484^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 20155097 - 2¹⁶ = 20089561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20151097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077548 + 10077549.

It is an arithmetic number, because the mean of its divisors is an integer number (10077549).

Almost surely, 2^20155097 is an apocalyptic number.

It is an amenable number.

20155097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155097 is an equidigital number, since it uses as much as digits as its factorization.

20155097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20155097 is about 4489.4428384823. The cubic root of 20155097 is about 272.1416190505.

The spelling of 20155097 in words is "twenty million, one hundred fifty-five thousand, ninety-seven".