20409039 has 18 divisors (see below), whose sum is σ = 34293480. Its totient is φ = 11662056.

The previous prime is 20409019. The next prime is 20409041. The reversal of 20409039 is 93090402.

It is not a de Polignac number, because 20409039 - 2⁵ = 20409007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409019) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22699 + ... + 23580.

Almost surely, 2^20409039 is an apocalyptic number.

20409039 is a deficient number, since it is larger than the sum of its proper divisors (13884441).

20409039 is a wasteful number, since it uses less digits than its factorization.

20409039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46299 (or 46289 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20409039 is about 4517.6364395555. The cubic root of 20409039 is about 273.2797920444.

The spelling of 20409039 in words is "twenty million, four hundred nine thousand, thirty-nine".