20811948 has 24 divisors (see below), whose sum is σ = 48706560. Its totient is φ = 6916560.

The previous prime is 20811911. The next prime is 20811953. The reversal of 20811948 is 84911802.

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, 1893 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (2029440).

Almost surely, 2^20811948 is an apocalyptic number.

It is an amenable number.

20811948 is an abundant number, since it is smaller than the sum of its proper divisors (27894612).

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

20811948 is a wasteful number, since it uses less digits than its factorization.

20811948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 20811948 is about 4562.0113984952. The cubic root of 20811948 is about 275.0664214213.

The spelling of 20811948 in words is "twenty million, eight hundred eleven thousand, nine hundred forty-eight".