20910804930 has 96 divisors (see below), whose sum is σ = 55882165248. Its totient is φ = 5421168000.

The previous prime is 20910804919. The next prime is 20910804949. The reversal of 20910804930 is 3940801902.

20910804930 is a `hidden beast` number, since 2 + 0 + 91 + 0 + 80 + 493 + 0 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7827495 + ... + 7830165.

It is an arithmetic number, because the mean of its divisors is an integer number (582105888).

Almost surely, 2^20910804930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20910804930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941082624).

20910804930 is an abundant number, since it is smaller than the sum of its proper divisors (34971360318).

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

20910804930 is a wasteful number, since it uses less digits than its factorization.

20910804930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5069 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 20910804930 in words is "twenty billion, nine hundred ten million, eight hundred four thousand, nine hundred thirty".