20299139 has 16 divisors (see below), whose sum is σ = 25141248. Its totient is φ = 15990912.

The previous prime is 20299117. The next prime is 20299151. The reversal of 20299139 is 93199202.

It is not a de Polignac number, because 20299139 - 2²⁴ = 3521923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20299099 and 20299108.

It is not an unprimeable number, because it can be changed into a prime (20299109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3134 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (1571328).

Almost surely, 2^20299139 is an apocalyptic number.

20299139 is a deficient number, since it is larger than the sum of its proper divisors (4842109).

20299139 is a wasteful number, since it uses less digits than its factorization.

20299139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 20299139 is about 4505.4565806364. The cubic root of 20299139 is about 272.7883836423.

The spelling of 20299139 in words is "twenty million, two hundred ninety-nine thousand, one hundred thirty-nine".