20648380 has 12 divisors (see below), whose sum is σ = 43361640. Its totient is φ = 8259344.

The previous prime is 20648357. The next prime is 20648389. The reversal of 20648380 is 8384602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648389) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 516190 + ... + 516229.

It is an arithmetic number, because the mean of its divisors is an integer number (3613470).

Almost surely, 2^20648380 is an apocalyptic number.

20648380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20648380 is an abundant number, since it is smaller than the sum of its proper divisors (22713260).

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

20648380 is a wasteful number, since it uses less digits than its factorization.

20648380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032428 (or 1032426 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20648380 is about 4544.0488553712. The cubic root of 20648380 is about 274.3439125534.

The spelling of 20648380 in words is "twenty million, six hundred forty-eight thousand, three hundred eighty".