20139600 has 120 divisors (see below), whose sum is σ = 69530272. Its totient is φ = 4953600.

The previous prime is 20139599. The next prime is 20139619. The reversal of 20139600 is 693102.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14955 + ... + 16245.

Almost surely, 2^20139600 is an apocalyptic number.

20139600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20139600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34765136).

20139600 is an abundant number, since it is smaller than the sum of its proper divisors (49390672).

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

20139600 is a wasteful number, since it uses less digits than its factorization.

20139600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20139600 is about 4487.7165685903. The cubic root of 20139600 is about 272.0718524132.

The spelling of 20139600 in words is "twenty million, one hundred thirty-nine thousand, six hundred".