20666892 has 12 divisors (see below), whose sum is σ = 48222776. Its totient is φ = 6888960.

The previous prime is 20666869. The next prime is 20666929. The reversal of 20666892 is 29866602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20666892.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861109 + ... + 861132.

Almost surely, 2^20666892 is an apocalyptic number.

It is an amenable number.

20666892 is an abundant number, since it is smaller than the sum of its proper divisors (27555884).

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

20666892 is a wasteful number, since it uses less digits than its factorization.

20666892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722248 (or 1722246 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20666892 is about 4546.0853489568. The cubic root of 20666892 is about 274.4258743915.

The spelling of 20666892 in words is "twenty million, six hundred sixty-six thousand, eight hundred ninety-two".