20451449 has 4 divisors (see below), whose sum is σ = 20697936. Its totient is φ = 20204964.

The previous prime is 20451443. The next prime is 20451451. The reversal of 20451449 is 94415402.

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 20451449 - 2¹² = 20447353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20451443) 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, 123119 + ... + 123284.

It is an arithmetic number, because the mean of its divisors is an integer number (5174484).

Almost surely, 2^20451449 is an apocalyptic number.

It is an amenable number.

20451449 is a deficient number, since it is larger than the sum of its proper divisors (246487).

20451449 is an equidigital number, since it uses as much as digits as its factorization.

20451449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246486.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20451449 is about 4522.3278297797. The cubic root of 20451449 is about 273.4689529577.

The spelling of 20451449 in words is "twenty million, four hundred fifty-one thousand, four hundred forty-nine".