20683900 has 72 divisors (see below), whose sum is σ = 49684320. Its totient is φ = 7448320.

The previous prime is 20683889. The next prime is 20683907. The reversal of 20683900 is 938602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20683907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 899289 + ... + 899311.

It is an arithmetic number, because the mean of its divisors is an integer number (690060).

Almost surely, 2^20683900 is an apocalyptic number.

20683900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20683900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24842160).

20683900 is an abundant number, since it is smaller than the sum of its proper divisors (29000420).

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

20683900 is a wasteful number, since it uses less digits than its factorization.

20683900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20683900 is about 4547.9555846556. The cubic root of 20683900 is about 274.5011341433.

The spelling of 20683900 in words is "twenty million, six hundred eighty-three thousand, nine hundred".