20236397 has 4 divisors (see below), whose sum is σ = 20889216. Its totient is φ = 19583580.

The previous prime is 20236361. The next prime is 20236423. The reversal of 20236397 is 79363202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20236397 - 2⁸ = 20236141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20236327) 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, 326363 + ... + 326424.

It is an arithmetic number, because the mean of its divisors is an integer number (5222304).

Almost surely, 2^20236397 is an apocalyptic number.

It is an amenable number.

20236397 is a deficient number, since it is larger than the sum of its proper divisors (652819).

20236397 is an equidigital number, since it uses as much as digits as its factorization.

20236397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652818.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 20236397 is about 4498.4883016409. The cubic root of 20236397 is about 272.5070424351.

Adding to 20236397 its reverse (79363202), we get a palindrome (99599599).

The spelling of 20236397 in words is "twenty million, two hundred thirty-six thousand, three hundred ninety-seven".