69820 has 12 divisors (see below), whose sum is σ = 146664. Its totient is φ = 27920.

The previous prime is 69809. The next prime is 69821. The reversal of 69820 is 2896.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69821) by changing a digit.

69820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1726 + ... + 1765.

It is an arithmetic number, because the mean of its divisors is an integer number (12222).

2⁶⁹⁸²⁰ is an apocalyptic number.

It is an amenable number.

69820 is an abundant number, since it is smaller than the sum of its proper divisors (76844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73332).

69820 is a wasteful number, since it uses less digits than its factorization.

69820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 69820 is about 264.2347441197. The cubic root of 69820 is about 41.1774973734.

The spelling of 69820 in words is "sixty-nine thousand, eight hundred twenty".