20525135400 has 384 divisors, whose sum is σ = 88144358400. Its totient is φ = 4264876800.

The previous prime is 20525135387. The next prime is 20525135437. The reversal of 20525135400 is 453152502.

It is a happy number.

20525135400 is a `hidden beast` number, since 2 + 0 + 5 + 251 + 3 + 5 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 391119 + ... + 440481.

It is an arithmetic number, because the mean of its divisors is an integer number (229542600).

Almost surely, 2^20525135400 is an apocalyptic number.

20525135400 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 20525135400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44072179200).

20525135400 is an abundant number, since it is smaller than the sum of its proper divisors (67619223000).

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

20525135400 is a wasteful number, since it uses less digits than its factorization.

20525135400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49406 (or 49391 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20525135400 its reverse (453152502), we get a palindrome (20978287902).

The spelling of 20525135400 in words is "twenty billion, five hundred twenty-five million, one hundred thirty-five thousand, four hundred".