20249568 has 96 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 6450048.

The previous prime is 20249563. The next prime is 20249599. The reversal of 20249568 is 86594202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20249561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19363 + ... + 20381.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^20249568 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 20249568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

20249568 is an abundant number, since it is smaller than the sum of its proper divisors (41440032).

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

20249568 is a wasteful number, since it uses less digits than its factorization.

20249568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20249568 is about 4499.9519997440. The cubic root of 20249568 is about 272.5661506491.

It can be divided in two parts, 202 and 49568, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 20249568 in words is "twenty million, two hundred forty-nine thousand, five hundred sixty-eight".