20297139 has 8 divisors (see below), whose sum is σ = 27433872. Its totient is φ = 13345920.

The previous prime is 20297131. The next prime is 20297143. The reversal of 20297139 is 93179202.

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

It is not a de Polignac number, because 20297139 - 2³ = 20297131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20297131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46122 + ... + 46559.

It is an arithmetic number, because the mean of its divisors is an integer number (3429234).

Almost surely, 2^20297139 is an apocalyptic number.

20297139 is a deficient number, since it is larger than the sum of its proper divisors (7136733).

20297139 is an equidigital number, since it uses as much as digits as its factorization.

20297139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92757.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20297139 is about 4505.2346220813. The cubic root of 20297139 is about 272.7794244005.

The spelling of 20297139 in words is "twenty million, two hundred ninety-seven thousand, one hundred thirty-nine".