20013449 has 4 divisors (see below), whose sum is σ = 20352720. Its totient is φ = 19674180.

The previous prime is 20013443. The next prime is 20013463. The reversal of 20013449 is 94431002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94431002 = 2 ⋅47215501.

It is a cyclic number.

It is not a de Polignac number, because 20013449 - 2⁸ = 20013193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013443) 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, 169547 + ... + 169664.

It is an arithmetic number, because the mean of its divisors is an integer number (5088180).

Almost surely, 2^20013449 is an apocalyptic number.

It is an amenable number.

20013449 is a deficient number, since it is larger than the sum of its proper divisors (339271).

20013449 is an equidigital number, since it uses as much as digits as its factorization.

20013449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339270.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20013449 is about 4473.6393462147. The cubic root of 20013449 is about 271.5025916974.

The spelling of 20013449 in words is "twenty million, thirteen thousand, four hundred forty-nine".