20963785 has 4 divisors (see below), whose sum is σ = 25156548. Its totient is φ = 16771024.

The previous prime is 20963777. The next prime is 20963797. The reversal of 20963785 is 58736902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2396304 + 18567481 = 1548^2 + 4309^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963785 - 2³ = 20963777 is a prime.

It is a super-5 number, since 5×20963785⁵ (a number of 38 digits) contains 55555 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096374 + ... + 2096383.

It is an arithmetic number, because the mean of its divisors is an integer number (6289137).

Almost surely, 2^20963785 is an apocalyptic number.

It is an amenable number.

20963785 is a deficient number, since it is larger than the sum of its proper divisors (4192763).

20963785 is an equidigital number, since it uses as much as digits as its factorization.

20963785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192762.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20963785 is about 4578.6226094755. The cubic root of 20963785 is about 275.7337320364.

The spelling of 20963785 in words is "twenty million, nine hundred sixty-three thousand, seven hundred eighty-five".