20452397 has 4 divisors (see below), whose sum is σ = 23374176. Its totient is φ = 17530620.

The previous prime is 20452363. The next prime is 20452427. The reversal of 20452397 is 79325402.

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 20452397 - 2¹⁰ = 20451373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452307) 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, 1460879 + ... + 1460892.

It is an arithmetic number, because the mean of its divisors is an integer number (5843544).

Almost surely, 2^20452397 is an apocalyptic number.

It is an amenable number.

20452397 is a deficient number, since it is larger than the sum of its proper divisors (2921779).

20452397 is an equidigital number, since it uses as much as digits as its factorization.

20452397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921778.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20452397 is about 4522.4326418422. The cubic root of 20452397 is about 273.4731783235.

Adding to 20452397 its reverse (79325402), we get a palindrome (99777799).

The spelling of 20452397 in words is "twenty million, four hundred fifty-two thousand, three hundred ninety-seven".