20427449 has 4 divisors (see below), whose sum is σ = 23345664. Its totient is φ = 17509236.

The previous prime is 20427439. The next prime is 20427457. The reversal of 20427449 is 94472402.

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 20427449 - 2¹² = 20423353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20427409) 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, 1459097 + ... + 1459110.

It is an arithmetic number, because the mean of its divisors is an integer number (5836416).

Almost surely, 2^20427449 is an apocalyptic number.

It is an amenable number.

20427449 is a deficient number, since it is larger than the sum of its proper divisors (2918215).

20427449 is an equidigital number, since it uses as much as digits as its factorization.

20427449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918214.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20427449 is about 4519.6735501582. The cubic root of 20427449 is about 273.3619381459.

The spelling of 20427449 in words is "twenty million, four hundred twenty-seven thousand, four hundred forty-nine".