20500424 has 64 divisors (see below), whose sum is σ = 46464000. Its totient is φ = 8467200.

The previous prime is 20500423. The next prime is 20500427. The reversal of 20500424 is 42400502.

It is not an unprimeable number, because it can be changed into a prime (20500423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84944 + ... + 85184.

It is an arithmetic number, because the mean of its divisors is an integer number (726000).

Almost surely, 2^20500424 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 20500424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23232000).

20500424 is an abundant number, since it is smaller than the sum of its proper divisors (25963576).

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

20500424 is a wasteful number, since it uses less digits than its factorization.

20500424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20500424 is about 4527.7393917937. The cubic root of 20500424 is about 273.6870705971.

Adding to 20500424 its reverse (42400502), we get a palindrome (62900926).

The spelling of 20500424 in words is "twenty million, five hundred thousand, four hundred twenty-four".