20666672 has 30 divisors (see below), whose sum is σ = 43364412. Its totient is φ = 9537216.

The previous prime is 20666671. The next prime is 20666687. The reversal of 20666672 is 27666602.

It is a super-2 number, since 2×20666672² = 854222663111168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20666671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118 + ... + 6525.

Almost surely, 2^20666672 is an apocalyptic number.

It is an amenable number.

20666672 is an abundant number, since it is smaller than the sum of its proper divisors (22697740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20666672 is a wasteful number, since it uses less digits than its factorization.

20666672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7677 (or 7658 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20666672 is about 4546.0611522504. The cubic root of 20666672 is about 274.4249006294.

The spelling of 20666672 in words is "twenty million, six hundred sixty-six thousand, six hundred seventy-two".