20835197 has 2 divisors, whose sum is σ = 20835198. Its totient is φ = 20835196.

The previous prime is 20835187. The next prime is 20835203. The reversal of 20835197 is 79153802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19456921 + 1378276 = 4411^2 + 1174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20835197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20835187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10417598 + 10417599.

It is an arithmetic number, because the mean of its divisors is an integer number (10417599).

Almost surely, 2^20835197 is an apocalyptic number.

It is an amenable number.

20835197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20835197 is an equidigital number, since it uses as much as digits as its factorization.

20835197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20835197 is about 4564.5587957655. The cubic root of 20835197 is about 275.1688087522.

Adding to 20835197 its reverse (79153802), we get a palindrome (99988999).

The spelling of 20835197 in words is "twenty million, eight hundred thirty-five thousand, one hundred ninety-seven".