20197393 has 4 divisors (see below), whose sum is σ = 20424420. Its totient is φ = 19970368.

The previous prime is 20197391. The next prime is 20197417. The reversal of 20197393 is 39379102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 6411024 = 3713^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 20197393 - 2¹ = 20197391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20197391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113380 + ... + 113557.

It is an arithmetic number, because the mean of its divisors is an integer number (5106105).

Almost surely, 2^20197393 is an apocalyptic number.

It is an amenable number.

20197393 is a deficient number, since it is larger than the sum of its proper divisors (227027).

20197393 is an equidigital number, since it uses as much as digits as its factorization.

20197393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227026.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 20197393 is about 4494.1509765472. The cubic root of 20197393 is about 272.3318514865.

The spelling of 20197393 in words is "twenty million, one hundred ninety-seven thousand, three hundred ninety-three".