20100397 has 2 divisors, whose sum is σ = 20100398. Its totient is φ = 20100396.

The previous prime is 20100391. The next prime is 20100401. The reversal of 20100397 is 79300102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 1901641 = 4266^2 + 1379^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100397 - 2³ = 20100389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100391) 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, 10050198 + 10050199.

It is an arithmetic number, because the mean of its divisors is an integer number (10050199).

Almost surely, 2^20100397 is an apocalyptic number.

It is an amenable number.

20100397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100397 is an equidigital number, since it uses as much as digits as its factorization.

20100397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20100397 is about 4483.3466294722. The cubic root of 20100397 is about 271.8952027441.

Adding to 20100397 its reverse (79300102), we get a palindrome (99400499).

The spelling of 20100397 in words is "twenty million, one hundred thousand, three hundred ninety-seven".