20099600 has 60 divisors (see below), whose sum is σ = 48838020. Its totient is φ = 7948800.

The previous prime is 20099567. The next prime is 20099617. The reversal of 20099600 is 699002.

It can be written as a sum of positive squares in 6 ways, for example, as 350464 + 19749136 = 592^2 + 4444^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20099600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43370 + ... + 43830.

It is an arithmetic number, because the mean of its divisors is an integer number (813967).

Almost surely, 2^20099600 is an apocalyptic number.

20099600 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 20099600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24419010).

20099600 is an abundant number, since it is smaller than the sum of its proper divisors (28738420).

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

20099600 is a wasteful number, since it uses less digits than its factorization.

20099600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20099600 is about 4483.2577440964. The cubic root of 20099600 is about 271.8916090615.

The spelling of 20099600 in words is "twenty million, ninety-nine thousand, six hundred".