20515453 has 16 divisors (see below), whose sum is σ = 24182784. Its totient is φ = 17040240.

The previous prime is 20515393. The next prime is 20515463. The reversal of 20515453 is 35451502.

It is not a de Polignac number, because 20515453 - 2⁹ = 20514941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41538 + ... + 42028.

It is an arithmetic number, because the mean of its divisors is an integer number (1511424).

Almost surely, 2^20515453 is an apocalyptic number.

It is an amenable number.

20515453 is a deficient number, since it is larger than the sum of its proper divisors (3667331).

20515453 is a wasteful number, since it uses less digits than its factorization.

20515453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20515453 is about 4529.3987459706. The cubic root of 20515453 is about 273.7539348767.

Adding to 20515453 its reverse (35451502), we get a palindrome (55966955).

The spelling of 20515453 in words is "twenty million, five hundred fifteen thousand, four hundred fifty-three".