20445928 has 16 divisors (see below), whose sum is σ = 39658500. Its totient is φ = 9870336.

The previous prime is 20445923. The next prime is 20445947. The reversal of 20445928 is 82954402.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 357604 = 4482^2 + 598^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20445893 and 20445902.

It is not an unprimeable number, because it can be changed into a prime (20445923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43833 + ... + 44296.

Almost surely, 2^20445928 is an apocalyptic number.

It is an amenable number.

20445928 is a deficient number, since it is larger than the sum of its proper divisors (19212572).

20445928 is a wasteful number, since it uses less digits than its factorization.

20445928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88164 (or 88160 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20445928 is about 4521.7173728574. The cubic root of 20445928 is about 273.4443425096. Note that the first 3 decimals are identical.

The spelling of 20445928 in words is "twenty million, four hundred forty-five thousand, nine hundred twenty-eight".