20723828 has 24 divisors (see below), whose sum is σ = 38283840. Its totient is φ = 9796160.

The previous prime is 20723827. The next prime is 20723849. The reversal of 20723828 is 82832702.

It is a junction number, because it is equal to n+sod(n) for n = 20723794 and 20723803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6923 + ... + 9453.

It is an arithmetic number, because the mean of its divisors is an integer number (1595160).

Almost surely, 2^20723828 is an apocalyptic number.

It is an amenable number.

20723828 is a deficient number, since it is larger than the sum of its proper divisors (17560012).

20723828 is a wasteful number, since it uses less digits than its factorization.

20723828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647 (or 2645 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20723828 is about 4552.3431329371. The cubic root of 20723828 is about 274.6776520517.

The spelling of 20723828 in words is "twenty million, seven hundred twenty-three thousand, eight hundred twenty-eight".