20910819948 has 24 divisors (see below), whose sum is σ = 48891299520. Its totient is φ = 6956075280.

The previous prime is 20910819931. The next prime is 20910819983. The reversal of 20910819948 is 84991801902.

It is a self number, because there is not a number n which added to its sum of digits gives 20910819948.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768618 + ... + 1780401.

It is an arithmetic number, because the mean of its divisors is an integer number (2037137480).

Almost surely, 2^20910819948 is an apocalyptic number.

It is an amenable number.

20910819948 is an abundant number, since it is smaller than the sum of its proper divisors (27980479572).

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

20910819948 is a wasteful number, since it uses less digits than its factorization.

20910819948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549517 (or 3549515 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 20910819948 in words is "twenty billion, nine hundred ten million, eight hundred nineteen thousand, nine hundred forty-eight".