20420449 has 8 divisors (see below), whose sum is σ = 23430528. Its totient is φ = 17433600.

The previous prime is 20420443. The next prime is 20420453. The reversal of 20420449 is 94402402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20420449 - 2¹¹ = 20418401 is a prime.

It is a super-3 number, since 3×20420449³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3877 + ... + 7474.

It is an arithmetic number, because the mean of its divisors is an integer number (2928816).

Almost surely, 2^20420449 is an apocalyptic number.

It is an amenable number.

20420449 is a deficient number, since it is larger than the sum of its proper divisors (3010079).

20420449 is a wasteful number, since it uses less digits than its factorization.

20420449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11615.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20420449 is about 4518.8990915930. The cubic root of 20420449 is about 273.3307097045.

The spelling of 20420449 in words is "twenty million, four hundred twenty thousand, four hundred forty-nine".