20670472 has 16 divisors (see below), whose sum is σ = 39019500. Its totient is φ = 10265280.

The previous prime is 20670467. The next prime is 20670479. The reversal of 20670472 is 27407602.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 4356 = 4546^2 + 66^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20670472.

It is not an unprimeable number, because it can be changed into a prime (20670479) 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, 7479 + ... + 9862.

Almost surely, 2^20670472 is an apocalyptic number.

It is an amenable number.

20670472 is a deficient number, since it is larger than the sum of its proper divisors (18349028).

20670472 is a wasteful number, since it uses less digits than its factorization.

20670472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17496 (or 17492 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20670472 is about 4546.4790772641. The cubic root of 20670472 is about 274.4417191850.

The spelling of 20670472 in words is "twenty million, six hundred seventy thousand, four hundred seventy-two".