20898438 has 32 divisors (see below), whose sum is σ = 46714752. Its totient is φ = 6177600.

The previous prime is 20898413. The next prime is 20898443. The reversal of 20898438 is 83489802.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20898438.

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 15 ways as a sum of consecutive naturals, for example, 1156 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1459836).

Almost surely, 2^20898438 is an apocalyptic number.

20898438 is an abundant number, since it is smaller than the sum of its proper divisors (25816314).

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

20898438 is a wasteful number, since it uses less digits than its factorization.

20898438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 20898438 is about 4571.4809416643. The cubic root of 20898438 is about 275.4469338494.

The spelling of 20898438 in words is "twenty million, eight hundred ninety-eight thousand, four hundred thirty-eight".