20947683 has 4 divisors (see below), whose sum is σ = 27930248. Its totient is φ = 13965120.

The previous prime is 20947669. The next prime is 20947727. The reversal of 20947683 is 38674902.

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

It is not a de Polignac number, because 20947683 - 2⁸ = 20947427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20947613) 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, 3491278 + ... + 3491283.

It is an arithmetic number, because the mean of its divisors is an integer number (6982562).

Almost surely, 2^20947683 is an apocalyptic number.

20947683 is a deficient number, since it is larger than the sum of its proper divisors (6982565).

20947683 is an equidigital number, since it uses as much as digits as its factorization.

20947683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982564.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20947683 is about 4576.8638826166. The cubic root of 20947683 is about 275.6631181695.

The spelling of 20947683 in words is "twenty million, nine hundred forty-seven thousand, six hundred eighty-three".