20131449 has 24 divisors (see below), whose sum is σ = 29602080. Its totient is φ = 12160512.

The previous prime is 20131427. The next prime is 20131487. The reversal of 20131449 is 94413102.

It is not a de Polignac number, because 20131449 - 2¹² = 20127353 is a prime.

It is a super-3 number, since 3×20131449³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20131499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29577 + ... + 30249.

It is an arithmetic number, because the mean of its divisors is an integer number (1233420).

Almost surely, 2^20131449 is an apocalyptic number.

It is an amenable number.

20131449 is a deficient number, since it is larger than the sum of its proper divisors (9470631).

20131449 is a wasteful number, since it uses less digits than its factorization.

20131449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20131449 is about 4486.8083310968. The cubic root of 20131449 is about 272.0351426984.

The spelling of 20131449 in words is "twenty million, one hundred thirty-one thousand, four hundred forty-nine".