20672228 has 12 divisors (see below), whose sum is σ = 38080560. Its totient is φ = 9792072.

The previous prime is 20672227. The next prime is 20672231. The reversal of 20672228 is 82227602.

It is a self number, because there is not a number n which added to its sum of digits gives 20672228.

It is not an unprimeable number, because it can be changed into a prime (20672227) 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, 135926 + ... + 136077.

It is an arithmetic number, because the mean of its divisors is an integer number (3173380).

Almost surely, 2^20672228 is an apocalyptic number.

It is an amenable number.

20672228 is a deficient number, since it is larger than the sum of its proper divisors (17408332).

20672228 is a wasteful number, since it uses less digits than its factorization.

20672228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272026 (or 272024 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20672228 is about 4546.6721896350. The cubic root of 20672228 is about 274.4494904317.

The spelling of 20672228 in words is "twenty million, six hundred seventy-two thousand, two hundred twenty-eight".