20670028 has 24 divisors (see below), whose sum is σ = 38519712. Its totient is φ = 9671424.

The previous prime is 20670007. The next prime is 20670047. The reversal of 20670028 is 82007602.

It is a junction number, because it is equal to n+sod(n) for n = 20669984 and 20670011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12625 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (1604988).

Almost surely, 2^20670028 is an apocalyptic number.

It is an amenable number.

20670028 is a deficient number, since it is larger than the sum of its proper divisors (17849684).

20670028 is a wasteful number, since it uses less digits than its factorization.

20670028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20670028 is about 4546.4302480078. The cubic root of 20670028 is about 274.4397541759.

The spelling of 20670028 in words is "twenty million, six hundred seventy thousand, twenty-eight".