20197397 has 8 divisors (see below), whose sum is σ = 22183200. Its totient is φ = 18236560.

The previous prime is 20197391. The next prime is 20197417. The reversal of 20197397 is 79379102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20197397 - 2⁸ = 20197141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20197397.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 4523 + ... + 7800.

It is an arithmetic number, because the mean of its divisors is an integer number (2772900).

Almost surely, 2^20197397 is an apocalyptic number.

It is an amenable number.

20197397 is a deficient number, since it is larger than the sum of its proper divisors (1985803).

20197397 is a wasteful number, since it uses less digits than its factorization.

20197397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12483.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 20197397 is about 4494.1514215700. The cubic root of 20197397 is about 272.3318694645.

The spelling of 20197397 in words is "twenty million, one hundred ninety-seven thousand, three hundred ninety-seven".