20525472 has 216 divisors, whose sum is σ = 69713280. Its totient is φ = 5702400.

The previous prime is 20525459. The next prime is 20525497. The reversal of 20525472 is 27452502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 662097 + ... + 662127.

Almost surely, 2^20525472 is an apocalyptic number.

20525472 is a gapful number since it is divisible by the number (22) 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 20525472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34856640).

20525472 is an abundant number, since it is smaller than the sum of its proper divisors (49187808).

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

20525472 is a wasteful number, since it uses less digits than its factorization.

20525472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20525472 is about 4530.5046076569. The cubic root of 20525472 is about 273.7984914411.

Adding to 20525472 its reverse (27452502), we get a palindrome (47977974).

The spelling of 20525472 in words is "twenty million, five hundred twenty-five thousand, four hundred seventy-two".