20152513 has 4 divisors (see below), whose sum is σ = 20198448. Its totient is φ = 20106580.

The previous prime is 20152493. The next prime is 20152523. The reversal of 20152513 is 31525102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20152513 - 2¹³ = 20144321 is a prime.

It is a super-2 number, since 2×20152513² = 812247560430338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20152523) 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, 22303 + ... + 23188.

It is an arithmetic number, because the mean of its divisors is an integer number (5049612).

Almost surely, 2^20152513 is an apocalyptic number.

It is an amenable number.

20152513 is a deficient number, since it is larger than the sum of its proper divisors (45935).

20152513 is an equidigital number, since it uses as much as digits as its factorization.

20152513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45934.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20152513 is about 4489.1550429897. The cubic root of 20152513 is about 272.1299885103.

Adding to 20152513 its reverse (31525102), we get a palindrome (51677615).

The spelling of 20152513 in words is "twenty million, one hundred fifty-two thousand, five hundred thirteen".