20525400 has 240 divisors, whose sum is σ = 81921840. Its totient is φ = 4665600.

The previous prime is 20525399. The next prime is 20525411. The reversal of 20525400 is 452502.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 113310 + ... + 113490.

It is an arithmetic number, because the mean of its divisors is an integer number (341341).

Almost surely, 2^20525400 is an apocalyptic number.

20525400 is a gapful number since it is divisible by the number (20) 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 20525400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40960920).

20525400 is an abundant number, since it is smaller than the sum of its proper divisors (61396440).

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

20525400 is a wasteful number, since it uses less digits than its factorization.

20525400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20525400 is about 4530.4966615152. The cubic root of 20525400 is about 273.7981712940.

Adding to 20525400 its reverse (452502), we get a palindrome (20977902).

The spelling of 20525400 in words is "twenty million, five hundred twenty-five thousand, four hundred".