20309760 has 216 divisors, whose sum is σ = 73657584. Its totient is φ = 5160960.

The previous prime is 20309753. The next prime is 20309771. The reversal of 20309760 is 6790302.

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, 472299 + ... + 472341.

Almost surely, 2^20309760 is an apocalyptic number.

20309760 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 20309760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36828792).

20309760 is an abundant number, since it is smaller than the sum of its proper divisors (53347824).

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

20309760 is a wasteful number, since it uses less digits than its factorization.

20309760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20309760 is about 4506.6351083708. The cubic root of 20309760 is about 272.8359518382.

The spelling of 20309760 in words is "twenty million, three hundred nine thousand, seven hundred sixty".