20212445520 has 480 divisors, whose sum is σ = 72389116800. Its totient is φ = 5046644736.

The previous prime is 20212445467. The next prime is 20212445531. The reversal of 20212445520 is 2554421202.

20212445520 is a `hidden beast` number, since 2 + 0 + 212 + 445 + 5 + 2 + 0 = 666.

It is a congruent number.

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, 185435226 + ... + 185435334.

It is an arithmetic number, because the mean of its divisors is an integer number (150810660).

Almost surely, 2^20212445520 is an apocalyptic number.

20212445520 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 20212445520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36194558400).

20212445520 is an abundant number, since it is smaller than the sum of its proper divisors (52176671280).

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

20212445520 is a wasteful number, since it uses less digits than its factorization.

20212445520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 20212445520 its reverse (2554421202), we get a palindrome (22766866722).

The spelling of 20212445520 in words is "twenty billion, two hundred twelve million, four hundred forty-five thousand, five hundred twenty".