20684992 has 28 divisors (see below), whose sum is σ = 42053256. Its totient is φ = 10088960.

The previous prime is 20684969. The next prime is 20685001. The reversal of 20684992 is 29948602.

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, 1318 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (1501902).

Almost surely, 2^20684992 is an apocalyptic number.

It is an amenable number.

20684992 is an abundant number, since it is smaller than the sum of its proper divisors (21368264).

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

20684992 is an equidigital number, since it uses as much as digits as its factorization.

20684992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936 (or 7926 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 20684992 is about 4548.0756370140. The cubic root of 20684992 is about 274.5059647920.

The spelling of 20684992 in words is "twenty million, six hundred eighty-four thousand, nine hundred ninety-two".