20615653306650 has 96 divisors (see below), whose sum is σ = 51586659938880. Its totient is φ = 5448265505280.

The previous prime is 20615653306627. The next prime is 20615653306657. The reversal of 20615653306650 is 5660335651602.

It is a super-2 number, since 2×20615653306650² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20615653306650.

It is not an unprimeable number, because it can be changed into a prime (20615653306657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6853281 + ... + 9391419.

It is an arithmetic number, because the mean of its divisors is an integer number (537361041030).

Almost surely, 2^{20615653306650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20615653306650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25793329969440).

20615653306650 is an abundant number, since it is smaller than the sum of its proper divisors (30971006632230).

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

20615653306650 is a wasteful number, since it uses less digits than its factorization.

20615653306650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538640 (or 2538635 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 48.

The spelling of 20615653306650 in words is "twenty trillion, six hundred fifteen billion, six hundred fifty-three million, three hundred six thousand, six hundred fifty".