20516 has 12 divisors (see below), whose sum is σ = 37632. Its totient is φ = 9768.

The previous prime is 20509. The next prime is 20521. The reversal of 20516 is 61502.

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20516.

It is an unprimeable number.

20516 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (3136).

2²⁰⁵¹⁶ is an apocalyptic number.

It is an amenable number.

20516 is a deficient number, since it is larger than the sum of its proper divisors (17116).

20516 is a wasteful number, since it uses less digits than its factorization.

20516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20516 is about 143.2340741584. The cubic root of 20516 is about 27.3756367873.

Subtracting from 20516 its sum of digits (14), we obtain a palindrome (20502).

The spelling of 20516 in words is "twenty thousand, five hundred sixteen".