20072515 has 4 divisors (see below), whose sum is σ = 24087024. Its totient is φ = 16058008.

The previous prime is 20072513. The next prime is 20072519. The reversal of 20072515 is 51527002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51527002 = 2 ⋅25763501.

It is a cyclic number.

It is not a de Polignac number, because 20072515 - 2¹ = 20072513 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20072513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007247 + ... + 2007256.

It is an arithmetic number, because the mean of its divisors is an integer number (6021756).

Almost surely, 2^20072515 is an apocalyptic number.

20072515 is a deficient number, since it is larger than the sum of its proper divisors (4014509).

20072515 is an equidigital number, since it uses as much as digits as its factorization.

20072515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014508.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20072515 is about 4480.2360428888. The cubic root of 20072515 is about 271.7694259575.

Adding to 20072515 its reverse (51527002), we get a palindrome (71599517).

The spelling of 20072515 in words is "twenty million, seventy-two thousand, five hundred fifteen".