20648371 has 4 divisors (see below), whose sum is σ = 20657592. Its totient is φ = 20639152.

The previous prime is 20648357. The next prime is 20648389. The reversal of 20648371 is 17384602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20648371 - 2²³ = 12259763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648321) 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, 1140 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (5164398).

Almost surely, 2^20648371 is an apocalyptic number.

20648371 is a deficient number, since it is larger than the sum of its proper divisors (9221).

20648371 is an equidigital number, since it uses as much as digits as its factorization.

20648371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20648371 is about 4544.0478650648. The cubic root of 20648371 is about 274.3438726940.

The spelling of 20648371 in words is "twenty million, six hundred forty-eight thousand, three hundred seventy-one".