20530449 has 16 divisors (see below), whose sum is σ = 31239040. Its totient is φ = 13316400.

The previous prime is 20530427. The next prime is 20530453. The reversal of 20530449 is 94403502.

It is not a de Polignac number, because 20530449 - 2⁵ = 20530417 is a prime.

It is a super-2 number, since 2×20530449² = 842998672283202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20570449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9277 + ... + 11274.

It is an arithmetic number, because the mean of its divisors is an integer number (1952440).

Almost surely, 2^20530449 is an apocalyptic number.

It is an amenable number.

20530449 is a deficient number, since it is larger than the sum of its proper divisors (10708591).

20530449 is a wasteful number, since it uses less digits than its factorization.

20530449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20597 (or 20591 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20530449 is about 4531.0538509270. The cubic root of 20530449 is about 273.8206197989.

The spelling of 20530449 in words is "twenty million, five hundred thirty thousand, four hundred forty-nine".