20645682 has 8 divisors (see below), whose sum is σ = 41291376. Its totient is φ = 6881892.

The previous prime is 20645671. The next prime is 20645683. The reversal of 20645682 is 28654602.

It is a sphenic number, since it is the product of 3 distinct primes.

20645682 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20645683) 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, 1720468 + ... + 1720479.

It is an arithmetic number, because the mean of its divisors is an integer number (5161422).

Almost surely, 2^20645682 is an apocalyptic number.

20645682 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20645682 is a wasteful number, since it uses less digits than its factorization.

20645682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440952.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20645682 is about 4543.7519738648. The cubic root of 20645682 is about 274.3319630749.

The spelling of 20645682 in words is "twenty million, six hundred forty-five thousand, six hundred eighty-two".