20332428 has 12 divisors (see below), whose sum is σ = 47442360. Its totient is φ = 6777472.

The previous prime is 20332409. The next prime is 20332439. The reversal of 20332428 is 82423302.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20332398 and 20332407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847173 + ... + 847196.

It is an arithmetic number, because the mean of its divisors is an integer number (3953530).

Almost surely, 2^20332428 is an apocalyptic number.

It is an amenable number.

20332428 is an abundant number, since it is smaller than the sum of its proper divisors (27109932).

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

20332428 is a wasteful number, since it uses less digits than its factorization.

20332428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694376 (or 1694374 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20332428 is about 4509.1493654569. The cubic root of 20332428 is about 272.9374194062.

The spelling of 20332428 in words is "twenty million, three hundred thirty-two thousand, four hundred twenty-eight".