20242515 has 16 divisors (see below), whose sum is σ = 33264288. Its totient is φ = 10503936.

The previous prime is 20242511. The next prime is 20242549. The reversal of 20242515 is 51524202.

It is a happy number.

It is not a de Polignac number, because 20242515 - 2² = 20242511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20242491 and 20242500.

It is not an unprimeable number, because it can be changed into a prime (20242511) 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 15 ways as a sum of consecutive naturals, for example, 17682 + ... + 18791.

It is an arithmetic number, because the mean of its divisors is an integer number (2079018).

Almost surely, 2^20242515 is an apocalyptic number.

20242515 is a deficient number, since it is larger than the sum of its proper divisors (13021773).

20242515 is a wasteful number, since it uses less digits than its factorization.

20242515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36518.

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

The square root of 20242515 is about 4499.1682564670. The cubic root of 20242515 is about 272.5345017056.

Adding to 20242515 its reverse (51524202), we get a palindrome (71766717).

The spelling of 20242515 in words is "twenty million, two hundred forty-two thousand, five hundred fifteen".