20508223904 has 96 divisors (see below), whose sum is σ = 49546619136. Its totient is φ = 8155607040.

The previous prime is 20508223889. The next prime is 20508223937. The reversal of 20508223904 is 40932280502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232442 + ... + 308294.

It is an arithmetic number, because the mean of its divisors is an integer number (516110616).

Almost surely, 2^20508223904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20508223904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24773309568).

20508223904 is an abundant number, since it is smaller than the sum of its proper divisors (29038395232).

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

20508223904 is a wasteful number, since it uses less digits than its factorization.

20508223904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75958 (or 75950 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 20508223904 in words is "twenty billion, five hundred eight million, two hundred twenty-three thousand, nine hundred four".