20896513 has 4 divisors (see below), whose sum is σ = 22796208. Its totient is φ = 18996820.

The previous prime is 20896493. The next prime is 20896517. The reversal of 20896513 is 31569802.

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 20896513 - 2⁵ = 20896481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20896517) 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 3 ways as a sum of consecutive naturals, for example, 949831 + ... + 949852.

It is an arithmetic number, because the mean of its divisors is an integer number (5699052).

Almost surely, 2^20896513 is an apocalyptic number.

It is an amenable number.

20896513 is a deficient number, since it is larger than the sum of its proper divisors (1899695).

20896513 is a wasteful number, since it uses less digits than its factorization.

20896513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899694.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20896513 is about 4571.2703923527. The cubic root of 20896513 is about 275.4384762535.

Subtracting 20896513 from its reverse (31569802), we obtain a square (10673289 = 3267²).

It can be divided in two parts, 208 and 96513, that added together give a square (96721 = 311²).

The spelling of 20896513 in words is "twenty million, eight hundred ninety-six thousand, five hundred thirteen".