20938478 has 8 divisors (see below), whose sum is σ = 34263000. Its totient is φ = 9517480.

The previous prime is 20938459. The next prime is 20938481. The reversal of 20938478 is 87483902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475853 + ... + 475896.

It is an arithmetic number, because the mean of its divisors is an integer number (4282875).

Almost surely, 2^20938478 is an apocalyptic number.

20938478 is a deficient number, since it is larger than the sum of its proper divisors (13324522).

20938478 is a wasteful number, since it uses less digits than its factorization.

20938478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951762.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20938478 is about 4575.8581708790. The cubic root of 20938478 is about 275.6227342159.

The spelling of 20938478 in words is "twenty million, nine hundred thirty-eight thousand, four hundred seventy-eight".