20478111 has 8 divisors (see below), whose sum is σ = 27325104. Its totient is φ = 13641600.

The previous prime is 20478109. The next prime is 20478121. The reversal of 20478111 is 11187402.

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

It is not a de Polignac number, because 20478111 - 2¹ = 20478109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5911 + ... + 8711.

It is an arithmetic number, because the mean of its divisors is an integer number (3415638).

Almost surely, 2^20478111 is an apocalyptic number.

20478111 is a deficient number, since it is larger than the sum of its proper divisors (6846993).

20478111 is a wasteful number, since it uses less digits than its factorization.

20478111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 20478111 is about 4525.2746877952. The cubic root of 20478111 is about 273.5877393748.

The spelling of 20478111 in words is "twenty million, four hundred seventy-eight thousand, one hundred eleven".