20520455200 has 576 divisors, whose sum is σ = 63783417600. Its totient is φ = 6418513920.

The previous prime is 20520455173. The next prime is 20520455201. The reversal of 20520455200 is 255402502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20520455201) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 247234359 + ... + 247234441.

It is an arithmetic number, because the mean of its divisors is an integer number (110735100).

Almost surely, 2^20520455200 is an apocalyptic number.

20520455200 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 20520455200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31891708800).

20520455200 is an abundant number, since it is smaller than the sum of its proper divisors (43262962400).

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

20520455200 is a wasteful number, since it uses less digits than its factorization.

20520455200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

Adding to 20520455200 its reverse (255402502), we get a palindrome (20775857702).

The spelling of 20520455200 in words is "twenty billion, five hundred twenty million, four hundred fifty-five thousand, two hundred".