20983954 has 4 divisors (see below), whose sum is σ = 31475934. Its totient is φ = 10491976.

The previous prime is 20983951. The next prime is 20983969. The reversal of 20983954 is 45938902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45938902 = 2 ⋅22969451.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 8838729 = 3485^2 + 2973^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20983951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5245987 + ... + 5245990.

Almost surely, 2^20983954 is an apocalyptic number.

20983954 is a deficient number, since it is larger than the sum of its proper divisors (10491980).

20983954 is a wasteful number, since it uses less digits than its factorization.

20983954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10491979.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 20983954 is about 4580.8245982574. The cubic root of 20983954 is about 275.8221303722.

The spelling of 20983954 in words is "twenty million, nine hundred eighty-three thousand, nine hundred fifty-four".