20835680 has 24 divisors (see below), whose sum is σ = 49224672. Its totient is φ = 8334208.

The previous prime is 20835679. The next prime is 20835707. The reversal of 20835680 is 8653802.

It is a super-2 number, since 2×20835680² = 868251122124800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent 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, 64952 + ... + 65271.

It is an arithmetic number, because the mean of its divisors is an integer number (2051028).

Almost surely, 2^20835680 is an apocalyptic number.

20835680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20835680 is an abundant number, since it is smaller than the sum of its proper divisors (28388992).

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

20835680 is a wasteful number, since it uses less digits than its factorization.

20835680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130238 (or 130230 counting only the distinct ones).

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

The square root of 20835680 is about 4564.6117030915. The cubic root of 20835680 is about 275.1709350501.

The spelling of 20835680 in words is "twenty million, eight hundred thirty-five thousand, six hundred eighty".