20212785 has 12 divisors (see below), whose sum is σ = 35035572. Its totient is φ = 10780128.

The previous prime is 20212771. The next prime is 20212799. The reversal of 20212785 is 58721202.

It is an interprime number because it is at equal distance from previous prime (20212771) and next prime (20212799).

It can be written as a sum of positive squares in 2 ways, for example, as 13571856 + 6640929 = 3684^2 + 2577^2 .

It is not a de Polignac number, because 20212785 - 2⁶ = 20212721 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 224542 + ... + 224631.

It is an arithmetic number, because the mean of its divisors is an integer number (2919631).

Almost surely, 2^20212785 is an apocalyptic number.

It is an amenable number.

20212785 is a deficient number, since it is larger than the sum of its proper divisors (14822787).

20212785 is a wasteful number, since it uses less digits than its factorization.

20212785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449184 (or 449181 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20212785 is about 4495.8630984495. The cubic root of 20212785 is about 272.4010133415.

Adding to 20212785 its reverse (58721202), we get a palindrome (78933987).

The spelling of 20212785 in words is "twenty million, two hundred twelve thousand, seven hundred eighty-five".