20078004 has 12 divisors (see below), whose sum is σ = 46848704. Its totient is φ = 6692664.

The previous prime is 20077999. The next prime is 20078021. The reversal of 20078004 is 40087002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 836572 + ... + 836595.

Almost surely, 2^20078004 is an apocalyptic number.

It is an amenable number.

20078004 is an abundant number, since it is smaller than the sum of its proper divisors (26770700).

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

20078004 is a wasteful number, since it uses less digits than its factorization.

20078004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673174 (or 1673172 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20078004 is about 4480.8485803473. The cubic root of 20078004 is about 271.7941962536.

It can be divided in two parts, 2007 and 8004, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 20078004 in words is "twenty million, seventy-eight thousand, four".