20397395 has 4 divisors (see below), whose sum is σ = 24476880. Its totient is φ = 16317912.

The previous prime is 20397383. The next prime is 20397409. The reversal of 20397395 is 59379302.

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

It is a cyclic number.

It is not a de Polignac number, because 20397395 - 2⁴ = 20397379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2039735 + ... + 2039744.

It is an arithmetic number, because the mean of its divisors is an integer number (6119220).

Almost surely, 2^20397395 is an apocalyptic number.

20397395 is a deficient number, since it is larger than the sum of its proper divisors (4079485).

20397395 is an equidigital number, since it uses as much as digits as its factorization.

20397395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079484.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 20397395 is about 4516.3475287006. The cubic root of 20397395 is about 273.2278105793.

The spelling of 20397395 in words is "twenty million, three hundred ninety-seven thousand, three hundred ninety-five".