20849646 has 16 divisors (see below), whose sum is σ = 41809104. Its totient is φ = 6931584.

The previous prime is 20849641. The next prime is 20849657. The reversal of 20849646 is 64694802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1995 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (2613069).

Almost surely, 2^20849646 is an apocalyptic number.

20849646 is an abundant number, since it is smaller than the sum of its proper divisors (20959458).

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

20849646 is a wasteful number, since it uses less digits than its factorization.

20849646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20849646 is about 4566.1412593129. The cubic root of 20849646 is about 275.2324029895.

Subtracting from 20849646 its product of nonzero digits (82944), we obtain a palindrome (20766702).

The spelling of 20849646 in words is "twenty million, eight hundred forty-nine thousand, six hundred forty-six".