20530451 has 8 divisors (see below), whose sum is σ = 21084624. Its totient is φ = 19982560.

The previous prime is 20530427. The next prime is 20530453. The reversal of 20530451 is 15403502.

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 20530451 - 2¹⁰ = 20529427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20530453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5465 + ... + 8421.

It is an arithmetic number, because the mean of its divisors is an integer number (2635578).

Almost surely, 2^20530451 is an apocalyptic number.

20530451 is a deficient number, since it is larger than the sum of its proper divisors (554173).

20530451 is a wasteful number, since it uses less digits than its factorization.

20530451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20530451 is about 4531.0540716262. The cubic root of 20530451 is about 273.8206286904.

Adding to 20530451 its reverse (15403502), we get a palindrome (35933953).

The spelling of 20530451 in words is "twenty million, five hundred thirty thousand, four hundred fifty-one".