20395998 has 24 divisors (see below), whose sum is σ = 50504688. Its totient is φ = 5827392.

The previous prime is 20395997. The next prime is 20396003. The reversal of 20395998 is 89959302.

20395998 is a `hidden beast` number, since 20 + 39 + 599 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20395993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80811 + ... + 81062.

It is an arithmetic number, because the mean of its divisors is an integer number (2104362).

Almost surely, 2^20395998 is an apocalyptic number.

20395998 is an abundant number, since it is smaller than the sum of its proper divisors (30108690).

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

20395998 is a wasteful number, since it uses less digits than its factorization.

20395998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161888 (or 161885 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 20395998 is about 4516.1928656779. The cubic root of 20395998 is about 273.2215727245.

The spelling of 20395998 in words is "twenty million, three hundred ninety-five thousand, nine hundred ninety-eight".