20982623 has 4 divisors (see below), whose sum is σ = 21000168. Its totient is φ = 20965080.

The previous prime is 20982613. The next prime is 20982653. The reversal of 20982623 is 32628902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20982623 - 2¹⁶ = 20917087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20982623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20982613) 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, 6836 + ... + 9417.

It is an arithmetic number, because the mean of its divisors is an integer number (5250042).

Almost surely, 2^20982623 is an apocalyptic number.

20982623 is a deficient number, since it is larger than the sum of its proper divisors (17545).

20982623 is a wasteful number, since it uses less digits than its factorization.

20982623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17544.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20982623 is about 4580.6793164333. The cubic root of 20982623 is about 275.8162985031.

The spelling of 20982623 in words is "twenty million, nine hundred eighty-two thousand, six hundred twenty-three".