20243770 has 32 divisors (see below), whose sum is σ = 38845008. Its totient is φ = 7569408.

The previous prime is 20243767. The next prime is 20243777. The reversal of 20243770 is 7734202.

It can be written as a sum of positive squares in 8 ways, for example, as 3359889 + 16883881 = 1833^2 + 4109^2 .

It is not an unprimeable number, because it can be changed into a prime (20243777) 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 15 ways as a sum of consecutive naturals, for example, 32502 + ... + 33118.

Almost surely, 2^20243770 is an apocalyptic number.

20243770 is a deficient number, since it is larger than the sum of its proper divisors (18601238).

20243770 is a wasteful number, since it uses less digits than its factorization.

20243770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20243770 is about 4499.3077245283. The cubic root of 20243770 is about 272.5401338077.

Adding to 20243770 its reverse (7734202), we get a palindrome (27977972).

The spelling of 20243770 in words is "twenty million, two hundred forty-three thousand, seven hundred seventy".