20641746 has 8 divisors (see below), whose sum is σ = 41283504. Its totient is φ = 6880580.

The previous prime is 20641739. The next prime is 20641769. The reversal of 20641746 is 64714602.

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

20641746 is an admirable number.

It is a Curzon number.

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, 1720140 + ... + 1720151.

It is an arithmetic number, because the mean of its divisors is an integer number (5160438).

Almost surely, 2^20641746 is an apocalyptic number.

20641746 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.

20641746 is a wasteful number, since it uses less digits than its factorization.

20641746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440296.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20641746 is about 4543.3188309869. The cubic root of 20641746 is about 274.3145286104.

The spelling of 20641746 in words is "twenty million, six hundred forty-one thousand, seven hundred forty-six".