20948 has 6 divisors (see below), whose sum is σ = 36666. Its totient is φ = 10472.

The previous prime is 20947. The next prime is 20959. The reversal of 20948 is 84902.

It can be written as a sum of positive squares in only one way, i.e., 20164 + 784 = 142^2 + 28^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20948.

It is not an unprimeable number, because it can be changed into a prime (20947) 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, 2615 + ... + 2622.

It is an arithmetic number, because the mean of its divisors is an integer number (6111).

2²⁰⁹⁴⁸ is an apocalyptic number.

It is an amenable number.

20948 is a deficient number, since it is larger than the sum of its proper divisors (15718).

20948 is a wasteful number, since it uses less digits than its factorization.

20948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241 (or 5239 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20948 is about 144.7342392110. The cubic root of 20948 is about 27.5664508693.

The spelling of 20948 in words is "twenty thousand, nine hundred forty-eight".