20470916 has 24 divisors (see below), whose sum is σ = 37068696. Its totient is φ = 9884160.

The previous prime is 20470889. The next prime is 20470939. The reversal of 20470916 is 61907402.

It can be written as a sum of positive squares in 4 ways, for example, as 2238016 + 18232900 = 1496^2 + 4270^2 .

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, 22796 + ... + 23676.

It is an arithmetic number, because the mean of its divisors is an integer number (1544529).

Almost surely, 2^20470916 is an apocalyptic number.

It is an amenable number.

20470916 is a deficient number, since it is larger than the sum of its proper divisors (16597780).

20470916 is a wasteful number, since it uses less digits than its factorization.

20470916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20470916 is about 4524.4796385883. The cubic root of 20470916 is about 273.5556938675. Note that the first 3 decimals are identical.

The spelling of 20470916 in words is "twenty million, four hundred seventy thousand, nine hundred sixteen".