20406678 has 16 divisors (see below), whose sum is σ = 41389056. Its totient is φ = 6706280.

The previous prime is 20406667. The next prime is 20406679. The reversal of 20406678 is 87660402.

It is a super-3 number, since 3×20406678³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406679) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23526 + ... + 24377.

It is an arithmetic number, because the mean of its divisors is an integer number (2586816).

Almost surely, 2^20406678 is an apocalyptic number.

20406678 is an abundant number, since it is smaller than the sum of its proper divisors (20982378).

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

20406678 is a wasteful number, since it uses less digits than its factorization.

20406678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47979.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20406678 is about 4517.3751227898. The cubic root of 20406678 is about 273.2692536016.

The spelling of 20406678 in words is "twenty million, four hundred six thousand, six hundred seventy-eight".