20139359 has 12 divisors (see below), whose sum is σ = 21206304. Its totient is φ = 19116864.

The previous prime is 20139349. The next prime is 20139409. The reversal of 20139359 is 95393102.

It is not a de Polignac number, because 20139359 - 2¹² = 20135263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64187 + ... + 64499.

It is an arithmetic number, because the mean of its divisors is an integer number (1767192).

Almost surely, 2^20139359 is an apocalyptic number.

20139359 is a deficient number, since it is larger than the sum of its proper divisors (1066945).

20139359 is an equidigital number, since it uses as much as digits as its factorization.

20139359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 20139359 is about 4487.6897174381. The cubic root of 20139359 is about 272.0707671619.

The spelling of 20139359 in words is "twenty million, one hundred thirty-nine thousand, three hundred fifty-nine".