20553624 has 96 divisors (see below), whose sum is σ = 68533920. Its totient is φ = 5419008.

The previous prime is 20553623. The next prime is 20553647. The reversal of 20553624 is 42635502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553623) 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, 4984 + ... + 8120.

It is an arithmetic number, because the mean of its divisors is an integer number (713895).

Almost surely, 2^20553624 is an apocalyptic number.

20553624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20553624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34266960).

20553624 is an abundant number, since it is smaller than the sum of its proper divisors (47980296).

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

20553624 is a wasteful number, since it uses less digits than its factorization.

20553624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20553624 is about 4533.6104817243. The cubic root of 20553624 is about 273.9236116465.

The spelling of 20553624 in words is "twenty million, five hundred fifty-three thousand, six hundred twenty-four".