20009139 has 8 divisors (see below), whose sum is σ = 26699712. Its totient is φ = 13329000.

The previous prime is 20009137. The next prime is 20009173. The reversal of 20009139 is 93190002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20009139 - 2¹ = 20009137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20009137) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5272 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (3337464).

Almost surely, 2^20009139 is an apocalyptic number.

20009139 is a deficient number, since it is larger than the sum of its proper divisors (6690573).

20009139 is a wasteful number, since it uses less digits than its factorization.

20009139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5217.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 20009139 is about 4473.1576095640. The cubic root of 20009139 is about 271.4831004679.

The spelling of 20009139 in words is "twenty million, nine thousand, one hundred thirty-nine".