20983356 has 72 divisors (see below), whose sum is σ = 55692000. Its totient is φ = 6652800.

The previous prime is 20983351. The next prime is 20983357. The reversal of 20983356 is 65338902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20983356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983351) 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, 105345 + ... + 105543.

It is an arithmetic number, because the mean of its divisors is an integer number (773500).

Almost surely, 2^20983356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20983356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27846000).

20983356 is an abundant number, since it is smaller than the sum of its proper divisors (34708644).

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

20983356 is a wasteful number, since it uses less digits than its factorization.

20983356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20983356 is about 4580.7593257014. The cubic root of 20983356 is about 275.8195102241.

The spelling of 20983356 in words is "twenty million, nine hundred eighty-three thousand, three hundred fifty-six".