20493197 has 2 divisors, whose sum is σ = 20493198. Its totient is φ = 20493196.

The previous prime is 20493131. The next prime is 20493257. The reversal of 20493197 is 79139402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15952036 + 4541161 = 3994^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20493197 - 2¹² = 20489101 is a prime.

It is a super-2 number, since 2×20493197² = 839942246561618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20493497) 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, 10246598 + 10246599.

It is an arithmetic number, because the mean of its divisors is an integer number (10246599).

Almost surely, 2^20493197 is an apocalyptic number.

It is an amenable number.

20493197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20493197 is an equidigital number, since it uses as much as digits as its factorization.

20493197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20493197 is about 4526.9412410589. The cubic root of 20493197 is about 273.6549059139.

The spelling of 20493197 in words is "twenty million, four hundred ninety-three thousand, one hundred ninety-seven".