20730836 has 12 divisors (see below), whose sum is σ = 41461728. Its totient is φ = 8884632.

The previous prime is 20730823. The next prime is 20730839. The reversal of 20730836 is 63803702.

20730836 is an admirable number.

It is a super-2 number, since 2×20730836² = 859535122517792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20730799 and 20730808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730839) by changing a digit.

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, 370166 + ... + 370221.

It is an arithmetic number, because the mean of its divisors is an integer number (3455144).

Almost surely, 2^20730836 is an apocalyptic number.

It is an amenable number.

20730836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20730836 is a wasteful number, since it uses less digits than its factorization.

20730836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740398 (or 740396 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20730836 is about 4553.1127813837. The cubic root of 20730836 is about 274.7086103612.

The spelling of 20730836 in words is "twenty million, seven hundred thirty thousand, eight hundred thirty-six".