20906672 has 10 divisors (see below), whose sum is σ = 40506708. Its totient is φ = 10453328.

The previous prime is 20906647. The next prime is 20906687. The reversal of 20906672 is 27660902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653318 + ... + 653349.

Almost surely, 2^20906672 is an apocalyptic number.

It is an amenable number.

20906672 is a deficient number, since it is larger than the sum of its proper divisors (19600036).

20906672 is a wasteful number, since it uses less digits than its factorization.

20906672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306675 (or 1306669 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20906672 is about 4572.3814364071. The cubic root of 20906672 is about 275.4831045312.

The spelling of 20906672 in words is "twenty million, nine hundred six thousand, six hundred seventy-two".