20806830 has 48 divisors (see below), whose sum is σ = 59018544. Its totient is φ = 5043840.

The previous prime is 20806829. The next prime is 20806847. The reversal of 20806830 is 3860802.

It is a super-3 number, since 3×20806830³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20806794 and 20806803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9519 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (1229553).

Almost surely, 2^20806830 is an apocalyptic number.

20806830 is an abundant number, since it is smaller than the sum of its proper divisors (38211714).

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

20806830 is a wasteful number, since it uses less digits than its factorization.

20806830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21041 (or 21038 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20806830 is about 4561.4504272216. The cubic root of 20806830 is about 275.0438717885.

The spelling of 20806830 in words is "twenty million, eight hundred six thousand, eight hundred thirty".