20139996 has 48 divisors (see below), whose sum is σ = 50206464. Its totient is φ = 6268416.

The previous prime is 20139991. The next prime is 20139997. The reversal of 20139996 is 69993102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139991) 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, 11020 + ... + 12716.

It is an arithmetic number, because the mean of its divisors is an integer number (1045968).

Almost surely, 2^20139996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20139996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25103232).

20139996 is an abundant number, since it is smaller than the sum of its proper divisors (30066468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20139996 is a wasteful number, since it uses less digits than its factorization.

20139996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1768 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 20139996 is about 4487.7606888068. The cubic root of 20139996 is about 272.0736356288.

The spelling of 20139996 in words is "twenty million, one hundred thirty-nine thousand, nine hundred ninety-six".