20135544 has 64 divisors (see below), whose sum is σ = 59149440. Its totient is φ = 5631360.

The previous prime is 20135539. The next prime is 20135587. The reversal of 20135544 is 44553102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (924210).

Almost surely, 2^20135544 is an apocalyptic number.

20135544 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 20135544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29574720).

20135544 is an abundant number, since it is smaller than the sum of its proper divisors (39013896).

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

20135544 is a wasteful number, since it uses less digits than its factorization.

20135544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5900 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20135544 is about 4487.2646456388. The cubic root of 20135544 is about 272.0535866164.

Adding to 20135544 its reverse (44553102), we get a palindrome (64688646).

It can be divided in two parts, 2013 and 5544, that added together give a palindrome (7557).

The spelling of 20135544 in words is "twenty million, one hundred thirty-five thousand, five hundred forty-four".