20520453 has 8 divisors (see below), whose sum is σ = 27383328. Its totient is φ = 13668944.

The previous prime is 20520433. The next prime is 20520499. The reversal of 20520453 is 35402502.

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 20520453 - 2⁵ = 20520421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520403) 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, 3226 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (3422916).

Almost surely, 2^20520453 is an apocalyptic number.

It is an amenable number.

20520453 is a deficient number, since it is larger than the sum of its proper divisors (6862875).

20520453 is a wasteful number, since it uses less digits than its factorization.

20520453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20520453 is about 4529.9506619830. The cubic root of 20520453 is about 273.7761727233.

Adding to 20520453 its reverse (35402502), we get a palindrome (55922955).

The spelling of 20520453 in words is "twenty million, five hundred twenty thousand, four hundred fifty-three".