20249785 has 8 divisors (see below), whose sum is σ = 24332616. Its totient is φ = 16177920.

The previous prime is 20249773. The next prime is 20249791. The reversal of 20249785 is 58794202.

It can be written as a sum of positive squares in 4 ways, for example, as 251001 + 19998784 = 501^2 + 4472^2 .

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

It is not a de Polignac number, because 20249785 - 2²¹ = 18152633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (3041577).

Almost surely, 2^20249785 is an apocalyptic number.

It is an amenable number.

20249785 is a deficient number, since it is larger than the sum of its proper divisors (4082831).

20249785 is an equidigital number, since it uses as much as digits as its factorization.

20249785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20249785 is about 4499.9761110477. The cubic root of 20249785 is about 272.5671242771.

The spelling of 20249785 in words is "twenty million, two hundred forty-nine thousand, seven hundred eighty-five".