20398854 has 32 divisors (see below), whose sum is σ = 46771200. Its totient is φ = 5810112.

The previous prime is 20398831. The next prime is 20398871. The reversal of 20398854 is 45889302.

It is a happy number.

It is a super-2 number, since 2×20398854² = 832226489026632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18922 + ... + 19970.

It is an arithmetic number, because the mean of its divisors is an integer number (1461600).

Almost surely, 2^20398854 is an apocalyptic number.

20398854 is an abundant number, since it is smaller than the sum of its proper divisors (26372346).

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

20398854 is a wasteful number, since it uses less digits than its factorization.

20398854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20398854 is about 4516.5090501404. The cubic root of 20398854 is about 273.2343249711.

The spelling of 20398854 in words is "twenty million, three hundred ninety-eight thousand, eight hundred fifty-four".