20399828 has 12 divisors (see below), whose sum is σ = 35734272. Its totient is φ = 10190040.

The previous prime is 20399807. The next prime is 20399831. The reversal of 20399828 is 82899302.

It is a congruent number.

It is an unprimeable number.

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, 4151 + ... + 7617.

It is an arithmetic number, because the mean of its divisors is an integer number (2977856).

Almost surely, 2^20399828 is an apocalyptic number.

It is an amenable number.

20399828 is a deficient number, since it is larger than the sum of its proper divisors (15334444).

20399828 is a wasteful number, since it uses less digits than its factorization.

20399828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4940 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20399828 is about 4516.6168754943. The cubic root of 20399828 is about 273.2386736794.

The spelling of 20399828 in words is "twenty million, three hundred ninety-nine thousand, eight hundred twenty-eight".