20902 has 8 divisors (see below), whose sum is σ = 35856. Its totient is φ = 8952.

The previous prime is 20899. The next prime is 20903.

20902 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903) 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 in 3 ways as a sum of consecutive naturals, for example, 733 + ... + 760.

It is an arithmetic number, because the mean of its divisors is an integer number (4482).

2²⁰⁹⁰² is an apocalyptic number.

20902 is a deficient number, since it is larger than the sum of its proper divisors (14954).

20902 is a wasteful number, since it uses less digits than its factorization.

20902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20902 is about 144.5752399272. The cubic root of 20902 is about 27.5462582327.

The spelling of 20902 in words is "twenty thousand, nine hundred two".