20983950 has 144 divisors (see below), whose sum is σ = 64589616. Its totient is φ = 4838400.

The previous prime is 20983927. The next prime is 20983951. The reversal of 20983950 is 5938902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983951) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 99345 + ... + 99555.

It is an arithmetic number, because the mean of its divisors is an integer number (448539).

Almost surely, 2^20983950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20983950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32294808).

20983950 is an abundant number, since it is smaller than the sum of its proper divisors (43605666).

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

20983950 is a wasteful number, since it uses less digits than its factorization.

20983950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20983950 is about 4580.8241616548. The cubic root of 20983950 is about 275.8221128463.

The spelling of 20983950 in words is "twenty million, nine hundred eighty-three thousand, nine hundred fifty".