20168397 has 12 divisors (see below), whose sum is σ = 29213184. Its totient is φ = 13408200.

The previous prime is 20168389. The next prime is 20168411. The reversal of 20168397 is 79386102.

20168397 is a `hidden beast` number, since 201 + 68 + 397 = 666.

It is not a de Polignac number, because 20168397 - 2³ = 20168389 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20168347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522 + ... + 6372.

It is an arithmetic number, because the mean of its divisors is an integer number (2434432).

Almost surely, 2^20168397 is an apocalyptic number.

It is an amenable number.

20168397 is a deficient number, since it is larger than the sum of its proper divisors (9044787).

20168397 is a wasteful number, since it uses less digits than its factorization.

20168397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240 (or 6237 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20168397 is about 4490.9238470497. The cubic root of 20168397 is about 272.2014664046.

The spelling of 20168397 in words is "twenty million, one hundred sixty-eight thousand, three hundred ninety-seven".