20806460 has 24 divisors (see below), whose sum is σ = 44295216. Its totient is φ = 8208000.

The previous prime is 20806459. The next prime is 20806507. The reversal of 20806460 is 6460802.

20806460 is nontrivially palindromic in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5666 + ... + 8585.

It is an arithmetic number, because the mean of its divisors is an integer number (1845634).

Almost surely, 2^20806460 is an apocalyptic number.

20806460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20806460 is an abundant number, since it is smaller than the sum of its proper divisors (23488756).

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

20806460 is a wasteful number, since it uses less digits than its factorization.

20806460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14333 (or 14331 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20806460 is about 4561.4098697661. The cubic root of 20806460 is about 275.0422414450.

The spelling of 20806460 in words is "twenty million, eight hundred six thousand, four hundred sixty".