20396936 has 48 divisors (see below), whose sum is σ = 45270540. Its totient is φ = 8588160.

The previous prime is 20396933. The next prime is 20396939. The reversal of 20396936 is 63969302.

It is an interprime number because it is at equal distance from previous prime (20396933) and next prime (20396939).

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 6002500 = 3794^2 + 2450^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20396936.

It is not an unprimeable number, because it can be changed into a prime (20396933) 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 11 ways as a sum of consecutive naturals, for example, 23486 + ... + 24338.

Almost surely, 2^20396936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20396936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22635270).

20396936 is an abundant number, since it is smaller than the sum of its proper divisors (24873604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20396936 is a wasteful number, since it uses less digits than its factorization.

20396936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 20396936 is about 4516.2967130161. The cubic root of 20396936 is about 273.2257610936.

The spelling of 20396936 in words is "twenty million, three hundred ninety-six thousand, nine hundred thirty-six".