20954 has 4 divisors (see below), whose sum is σ = 31434. Its totient is φ = 10476.

The previous prime is 20947. The next prime is 20959. The reversal of 20954 is 45902.

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

It can be written as a sum of positive squares in only one way, i.e., 15625 + 5329 = 125^2 + 73^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20954.

It is not an unprimeable number, because it can be changed into a prime (20959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5237 + ... + 5240.

2²⁰⁹⁵⁴ is an apocalyptic number.

20954 is a deficient number, since it is larger than the sum of its proper divisors (10480).

20954 is a wasteful number, since it uses less digits than its factorization.

20954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10479.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20954 is about 144.7549653725. The cubic root of 20954 is about 27.5690825115.

The spelling of 20954 in words is "twenty thousand, nine hundred fifty-four".