20639300 has 72 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 7235200.

The previous prime is 20639291. The next prime is 20639327. The reversal of 20639300 is 393602.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31577 + ... + 32223.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^20639300 is an apocalyptic number.

20639300 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 20639300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

20639300 is an abundant number, since it is smaller than the sum of its proper divisors (29982460).

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

20639300 is a wasteful number, since it uses less digits than its factorization.

20639300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20639300 is about 4543.0496365327. The cubic root of 20639300 is about 274.3036929663.

The spelling of 20639300 in words is "twenty million, six hundred thirty-nine thousand, three hundred".