20248705 has 8 divisors (see below), whose sum is σ = 24323904. Its totient is φ = 16182000.

The previous prime is 20248691. The next prime is 20248729. The reversal of 20248705 is 50784202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20248705 - 2⁷ = 20248577 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 5860 + ... + 8650.

It is an arithmetic number, because the mean of its divisors is an integer number (3040488).

Almost surely, 2^20248705 is an apocalyptic number.

It is an amenable number.

20248705 is a deficient number, since it is larger than the sum of its proper divisors (4075199).

20248705 is a wasteful number, since it uses less digits than its factorization.

20248705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20248705 is about 4499.8561088106. The cubic root of 20248705 is about 272.5622785018.

The spelling of 20248705 in words is "twenty million, two hundred forty-eight thousand, seven hundred five".