20217136 has 20 divisors (see below), whose sum is σ = 39379672. Its totient is φ = 10054656.

The previous prime is 20217103. The next prime is 20217137. The reversal of 20217136 is 63171202.

It is not an unprimeable number, because it can be changed into a prime (20217137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186 + ... + 6361.

Almost surely, 2^20217136 is an apocalyptic number.

It is an amenable number.

20217136 is a deficient number, since it is larger than the sum of its proper divisors (19162536).

20217136 is a wasteful number, since it uses less digits than its factorization.

20217136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748 (or 6742 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20217136 is about 4496.3469617012. The cubic root of 20217136 is about 272.4205576015.

Adding to 20217136 its reverse (63171202), we get a palindrome (83388338).

It can be divided in two parts, 20 and 217136, that added together give a square (217156 = 466²).

The spelling of 20217136 in words is "twenty million, two hundred seventeen thousand, one hundred thirty-six".