20521069200 has 240 divisors, whose sum is σ = 76216371840. Its totient is φ = 5234296320.

The previous prime is 20521069199. The next prime is 20521069207. The reversal of 20521069200 is 296012502.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×20521069200² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20521069207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207094 + ... + 289706.

It is an arithmetic number, because the mean of its divisors is an integer number (317568216).

Almost surely, 2^20521069200 is an apocalyptic number.

20521069200 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 20521069200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38108185920).

20521069200 is an abundant number, since it is smaller than the sum of its proper divisors (55695302640).

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

20521069200 is a wasteful number, since it uses less digits than its factorization.

20521069200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82663 (or 82646 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 20521069200 in words is "twenty billion, five hundred twenty-one million, sixty-nine thousand, two hundred".