20091004 has 12 divisors (see below), whose sum is σ = 35191800. Its totient is φ = 10036208.

The previous prime is 20090977. The next prime is 20091023. The reversal of 20091004 is 40019002.

20091004 is nontrivially palindromic in base 7.

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 3 ways as a sum of consecutive naturals, for example, 5367 + ... + 8305.

It is an arithmetic number, because the mean of its divisors is an integer number (2932650).

Almost surely, 2^20091004 is an apocalyptic number.

It is an amenable number.

20091004 is a deficient number, since it is larger than the sum of its proper divisors (15100796).

20091004 is a wasteful number, since it uses less digits than its factorization.

20091004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652 (or 4650 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20091004 is about 4482.2989637016. The cubic root of 20091004 is about 271.8528435549.

It can be divided in two parts, 2009 and 1004, that multiplied together give a triangular number (2017036 = T₂₀₀₈).

The spelling of 20091004 in words is "twenty million, ninety-one thousand, four".