20896515 has 16 divisors (see below), whose sum is σ = 37149600. Its totient is φ = 11144736.

The previous prime is 20896493. The next prime is 20896517. The reversal of 20896515 is 51569802.

It is a happy number.

It is not a de Polignac number, because 20896515 - 2⁵ = 20896483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20896515.

It is not an unprimeable number, because it can be changed into a prime (20896517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77260 + ... + 77529.

It is an arithmetic number, because the mean of its divisors is an integer number (2321850).

Almost surely, 2^20896515 is an apocalyptic number.

20896515 is a deficient number, since it is larger than the sum of its proper divisors (16253085).

20896515 is a wasteful number, since it uses less digits than its factorization.

20896515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154803 (or 154797 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 20896515 is about 4571.2706111102. The cubic root of 20896515 is about 275.4384850409.

The spelling of 20896515 in words is "twenty million, eight hundred ninety-six thousand, five hundred fifteen".