20006478 has 24 divisors (see below), whose sum is σ = 43459416. Its totient is φ = 6651600.

The previous prime is 20006431. The next prime is 20006489. The reversal of 20006478 is 87460002.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7093 + ... + 9503.

It is an arithmetic number, because the mean of its divisors is an integer number (1810809).

Almost surely, 2^20006478 is an apocalyptic number.

20006478 is an abundant number, since it is smaller than the sum of its proper divisors (23452938).

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

20006478 is a wasteful number, since it uses less digits than its factorization.

20006478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880 (or 2877 counting only the distinct ones).

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

The square root of 20006478 is about 4472.8601587798. The cubic root of 20006478 is about 271.4710651581.

The spelling of 20006478 in words is "twenty million, six thousand, four hundred seventy-eight".