20786380 has 36 divisors (see below), whose sum is σ = 46085760. Its totient is φ = 7874208.

The previous prime is 20786377. The next prime is 20786407. The reversal of 20786380 is 8368702.

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 11 ways as a sum of consecutive naturals, for example, 5781 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (1280160).

Almost surely, 2^20786380 is an apocalyptic number.

20786380 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 20786380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23042880).

20786380 is an abundant number, since it is smaller than the sum of its proper divisors (25299380).

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

20786380 is a wasteful number, since it uses less digits than its factorization.

20786380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20786380 is about 4559.2082646003. The cubic root of 20786380 is about 274.9537332632.

The spelling of 20786380 in words is "twenty million, seven hundred eighty-six thousand, three hundred eighty".