20324521620 has 480 divisors, whose sum is σ = 71000012160. Its totient is φ = 4836049920.

The previous prime is 20324521601. The next prime is 20324521621. The reversal of 20324521620 is 2612542302.

It is a happy number.

20324521620 is a `hidden beast` number, since 2 + 0 + 32 + 4 + 5 + 2 + 1 + 620 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324521621) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 146219511 + ... + 146219649.

It is an arithmetic number, because the mean of its divisors is an integer number (147916692).

Almost surely, 2^20324521620 is an apocalyptic number.

20324521620 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 20324521620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35500006080).

20324521620 is an abundant number, since it is smaller than the sum of its proper divisors (50675490540).

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

20324521620 is a wasteful number, since it uses less digits than its factorization.

20324521620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 20324521620 in words is "twenty billion, three hundred twenty-four million, five hundred twenty-one thousand, six hundred twenty".