20503152 has 80 divisors (see below), whose sum is σ = 60789760. Its totient is φ = 6609600.

The previous prime is 20503151. The next prime is 20503159. The reversal of 20503152 is 25130502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503151) 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, 12627 + ... + 14157.

It is an arithmetic number, because the mean of its divisors is an integer number (759872).

Almost surely, 2^20503152 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 20503152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30394880).

20503152 is an abundant number, since it is smaller than the sum of its proper divisors (40286608).

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

20503152 is a wasteful number, since it uses less digits than its factorization.

20503152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20503152 is about 4528.0406358601. The cubic root of 20503152 is about 273.6992099430.

Adding to 20503152 its reverse (25130502), we get a palindrome (45633654).

The spelling of 20503152 in words is "twenty million, five hundred three thousand, one hundred fifty-two".