20992983 has 16 divisors (see below), whose sum is σ = 31521792. Its totient is φ = 12312000.

The previous prime is 20992981. The next prime is 20993003. The reversal of 20992983 is 38929902.

It is not a de Polignac number, because 20992983 - 2¹ = 20992981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20992981) 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, 9238 + ... + 11283.

It is an arithmetic number, because the mean of its divisors is an integer number (1970112).

Almost surely, 2^20992983 is an apocalyptic number.

20992983 is a deficient number, since it is larger than the sum of its proper divisors (10528809).

20992983 is a wasteful number, since it uses less digits than its factorization.

20992983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20566.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 20992983 is about 4581.8100135209. The cubic root of 20992983 is about 275.8616850546.

It can be divided in two parts, 209929 and 83, that added together give a palindrome (210012).

The spelling of 20992983 in words is "twenty million, nine hundred ninety-two thousand, nine hundred eighty-three".