20745036 has 72 divisors (see below), whose sum is σ = 59470320. Its totient is φ = 6044544.

The previous prime is 20745031. The next prime is 20745037. The reversal of 20745036 is 63054702.

It is a happy number.

20745036 is a `hidden beast` number, since 207 + 450 + 3 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (20745031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7726 + ... + 10058.

Almost surely, 2^20745036 is an apocalyptic number.

20745036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20745036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29735160).

20745036 is an abundant number, since it is smaller than the sum of its proper divisors (38725284).

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

20745036 is a wasteful number, since it uses less digits than its factorization.

20745036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20745036 is about 4554.6718871945. The cubic root of 20745036 is about 274.7713184281.

Adding to 20745036 its reverse (63054702), we get a palindrome (83799738).

The spelling of 20745036 in words is "twenty million, seven hundred forty-five thousand, thirty-six".