20563950 has 96 divisors (see below), whose sum is σ = 56639232. Its totient is φ = 4936800.

The previous prime is 20563913. The next prime is 20563969. The reversal of 20563950 is 5936502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 199599 + ... + 199701.

It is an arithmetic number, because the mean of its divisors is an integer number (589992).

Almost surely, 2^20563950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20563950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28319616).

20563950 is an abundant number, since it is smaller than the sum of its proper divisors (36075282).

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

20563950 is a wasteful number, since it uses less digits than its factorization.

20563950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20563950 is about 4534.7491661612. The cubic root of 20563950 is about 273.9694764158.

It can be divided in two parts, 2056 and 3950, that added together give a palindrome (6006).

The spelling of 20563950 in words is "twenty million, five hundred sixty-three thousand, nine hundred fifty".