20800380 has 96 divisors (see below), whose sum is σ = 61544448. Its totient is φ = 5241600.

The previous prime is 20800379. The next prime is 20800393. The reversal of 20800380 is 8300802.

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, 98475 + ... + 98685.

It is an arithmetic number, because the mean of its divisors is an integer number (641088).

Almost surely, 2^20800380 is an apocalyptic number.

20800380 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 20800380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30772224).

20800380 is an abundant number, since it is smaller than the sum of its proper divisors (40744068).

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

20800380 is a wasteful number, since it uses less digits than its factorization.

20800380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20800380 is about 4560.7433604622. The cubic root of 20800380 is about 275.0154481680.

The spelling of 20800380 in words is "twenty million, eight hundred thousand, three hundred eighty".