20421016308 has 576 divisors, whose sum is σ = 70849658880. Its totient is φ = 4800902400.

The previous prime is 20421016211. The next prime is 20421016313. The reversal of 20421016308 is 80361012402.

20421016308 is a `hidden beast` number, since 2 + 0 + 4 + 21 + 0 + 1 + 630 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 160795341 + ... + 160795467.

It is an arithmetic number, because the mean of its divisors is an integer number (123002880).

Almost surely, 2^20421016308 is an apocalyptic number.

20421016308 is a gapful number since it is divisible by the number (28) 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 20421016308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35424829440).

20421016308 is an abundant number, since it is smaller than the sum of its proper divisors (50428642572).

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

20421016308 is a wasteful number, since it uses less digits than its factorization.

20421016308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 20421016308 in words is "twenty billion, four hundred twenty-one million, sixteen thousand, three hundred eight".