20642640042200 has 48 divisors (see below), whose sum is σ = 52357241567160. Its totient is φ = 7506414560000.

The previous prime is 20642640042191. The next prime is 20642640042209. The reversal of 20642640042200 is 224004624602.

It is an interprime number because it is at equal distance from previous prime (20642640042191) and next prime (20642640042209).

It is a super-2 number, since 2×20642640042200² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642640042209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4691506901 + ... + 4691511300.

Almost surely, 2^{20642640042200} is an apocalyptic number.

20642640042200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20642640042200 is an abundant number, since it is smaller than the sum of its proper divisors (31714601524960).

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

20642640042200 is a wasteful number, since it uses less digits than its factorization.

20642640042200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9383018228 (or 9383018219 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 20642640042200 its reverse (224004624602), we get a palindrome (20866644666802).

The spelling of 20642640042200 in words is "twenty trillion, six hundred forty-two billion, six hundred forty million, forty-two thousand, two hundred".