20504415 has 16 divisors (see below), whose sum is σ = 33100128. Its totient is φ = 10838016.

The previous prime is 20504413. The next prime is 20504417. The reversal of 20504415 is 51440502.

It is an interprime number because it is at equal distance from previous prime (20504413) and next prime (20504417).

It is not a de Polignac number, because 20504415 - 2¹ = 20504413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20504391 and 20504400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4354 + ... + 7743.

It is an arithmetic number, because the mean of its divisors is an integer number (2068758).

Almost surely, 2^20504415 is an apocalyptic number.

20504415 is a deficient number, since it is larger than the sum of its proper divisors (12595713).

20504415 is a wasteful number, since it uses less digits than its factorization.

20504415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12218.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20504415 is about 4528.1800980085. The cubic root of 20504415 is about 273.7048298107.

Adding to 20504415 its reverse (51440502), we get a palindrome (71944917).

The spelling of 20504415 in words is "twenty million, five hundred four thousand, four hundred fifteen".