20398378 has 64 divisors (see below), whose sum is σ = 42964992. Its totient is φ = 7001280.

The previous prime is 20398333. The next prime is 20398387. The reversal of 20398378 is 87389302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20398378.

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 31 ways as a sum of consecutive naturals, for example, 45825 + ... + 46267.

It is an arithmetic number, because the mean of its divisors is an integer number (671328).

Almost surely, 2^20398378 is an apocalyptic number.

20398378 is an abundant number, since it is smaller than the sum of its proper divisors (22566614).

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

20398378 is a wasteful number, since it uses less digits than its factorization.

20398378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20398378 is about 4516.4563542671. The cubic root of 20398378 is about 273.2321996794.

The spelling of 20398378 in words is "twenty million, three hundred ninety-eight thousand, three hundred seventy-eight".