20400242004216 has 96 divisors (see below), whose sum is σ = 55434505526400. Its totient is φ = 6777456079680.

The previous prime is 20400242004211. The next prime is 20400242004223. The reversal of 20400242004216 is 61240024200402.

20400242004216 is a `hidden beast` number, since 2 + 0 + 400 + 2 + 4 + 200 + 42 + 16 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20400242004216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400242004211) 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, 471213531 + ... + 471256821.

It is an arithmetic number, because the mean of its divisors is an integer number (577442765900).

Almost surely, 2^{20400242004216} is an apocalyptic number.

It is an amenable number.

20400242004216 is an abundant number, since it is smaller than the sum of its proper divisors (35034263522184).

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

20400242004216 is a wasteful number, since it uses less digits than its factorization.

20400242004216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64929 (or 64922 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 20400242004216 its reverse (61240024200402), we get a palindrome (81640266204618).

The spelling of 20400242004216 in words is "twenty trillion, four hundred billion, two hundred forty-two million, four thousand, two hundred sixteen".