20399798 has 16 divisors (see below), whose sum is σ = 31810560. Its totient is φ = 9801000.

The previous prime is 20399773. The next prime is 20399807. The reversal of 20399798 is 89799302.

It is a Curzon number.

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, 8273 + ... + 10451.

It is an arithmetic number, because the mean of its divisors is an integer number (1988160).

Almost surely, 2^20399798 is an apocalyptic number.

20399798 is a deficient number, since it is larger than the sum of its proper divisors (11410762).

20399798 is a wasteful number, since it uses less digits than its factorization.

20399798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20399798 is about 4516.6135544233. The cubic root of 20399798 is about 273.2385397377.

It can be divided in two parts, 203 and 99798, that added together give a palindrome (100001).

The spelling of 20399798 in words is "twenty million, three hundred ninety-nine thousand, seven hundred ninety-eight".