20451297 has 4 divisors (see below), whose sum is σ = 27268400. Its totient is φ = 13634196.

The previous prime is 20451271. The next prime is 20451311. The reversal of 20451297 is 79215402.

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 not a de Polignac number, because 20451297 - 2¹⁴ = 20434913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20451247) 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, 3408547 + ... + 3408552.

It is an arithmetic number, because the mean of its divisors is an integer number (6817100).

Almost surely, 2^20451297 is an apocalyptic number.

It is an amenable number.

20451297 is a deficient number, since it is larger than the sum of its proper divisors (6817103).

20451297 is an equidigital number, since it uses as much as digits as its factorization.

20451297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6817102.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20451297 is about 4522.3110242441. The cubic root of 20451297 is about 273.4682754607.

Adding to 20451297 its reverse (79215402), we get a palindrome (99666699).

The spelling of 20451297 in words is "twenty million, four hundred fifty-one thousand, two hundred ninety-seven".