20139259 has 8 divisors (see below), whose sum is σ = 24227840. Its totient is φ = 16353576.

The previous prime is 20139257. The next prime is 20139269. The reversal of 20139259 is 95293102.

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

It is a cyclic number.

It is not a de Polignac number, because 20139259 - 2¹ = 20139257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20139259.

It is not an unprimeable number, because it can be changed into a prime (20139257) 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, 75579 + ... + 75844.

It is an arithmetic number, because the mean of its divisors is an integer number (3028480).

Almost surely, 2^20139259 is an apocalyptic number.

20139259 is a deficient number, since it is larger than the sum of its proper divisors (4088581).

20139259 is a wasteful number, since it uses less digits than its factorization.

20139259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151449.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20139259 is about 4487.6785758341. The cubic root of 20139259 is about 272.0703168477.

The spelling of 20139259 in words is "twenty million, one hundred thirty-nine thousand, two hundred fifty-nine".