20853680 has 20 divisors (see below), whose sum is σ = 48484992. Its totient is φ = 8341440.

The previous prime is 20853673. The next prime is 20853719. The reversal of 20853680 is 8635802.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130256 + ... + 130415.

Almost surely, 2^20853680 is an apocalyptic number.

20853680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20853680 is an abundant number, since it is smaller than the sum of its proper divisors (27631312).

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

20853680 is a wasteful number, since it uses less digits than its factorization.

20853680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260684 (or 260678 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20853680 is about 4566.5829676028. The cubic root of 20853680 is about 275.2501525461.

The spelling of 20853680 in words is "twenty million, eight hundred fifty-three thousand, six hundred eighty".