208791375420 has 96 divisors (see below), whose sum is σ = 593155358208. Its totient is φ = 54867808512.

The previous prime is 208791375407. The next prime is 208791375433. The reversal of 208791375420 is 24573197802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (208791375407) and next prime (208791375433).

It is a self number, because there is not a number n which added to its sum of digits gives 208791375420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1924257 + ... + 2029863.

It is an arithmetic number, because the mean of its divisors is an integer number (6178701648).

Almost surely, 2^208791375420 is an apocalyptic number.

208791375420 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 208791375420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296577679104).

208791375420 is an abundant number, since it is smaller than the sum of its proper divisors (384363982788).

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

208791375420 is a wasteful number, since it uses less digits than its factorization.

208791375420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106099 (or 106097 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 208791375420 in words is "two hundred eight billion, seven hundred ninety-one million, three hundred seventy-five thousand, four hundred twenty".