20478006 has 12 divisors (see below), whose sum is σ = 44369052. Its totient is φ = 6825996.

The previous prime is 20477987. The next prime is 20478023. The reversal of 20478006 is 60087402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 568816 + ... + 568851.

It is an arithmetic number, because the mean of its divisors is an integer number (3697421).

Almost surely, 2^20478006 is an apocalyptic number.

20478006 is an abundant number, since it is smaller than the sum of its proper divisors (23891046).

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

20478006 is a wasteful number, since it uses less digits than its factorization.

20478006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137675 (or 1137672 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20478006 is about 4525.2630862747. The cubic root of 20478006 is about 273.5872717737.

It can be divided in two parts, 204 and 78006, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 20478006 in words is "twenty million, four hundred seventy-eight thousand, six".