20853646 has 8 divisors (see below), whose sum is σ = 34124184. Its totient is φ = 9478920.

The previous prime is 20853641. The next prime is 20853649. The reversal of 20853646 is 64635802.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853641) 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, 473925 + ... + 473968.

It is an arithmetic number, because the mean of its divisors is an integer number (4265523).

Almost surely, 2^20853646 is an apocalyptic number.

20853646 is a deficient number, since it is larger than the sum of its proper divisors (13270538).

20853646 is a wasteful number, since it uses less digits than its factorization.

20853646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947906.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20853646 is about 4566.5792449053. The cubic root of 20853646 is about 275.2500029561.

The spelling of 20853646 in words is "twenty million, eight hundred fifty-three thousand, six hundred forty-six".