20650636615 has 32 divisors (see below), whose sum is σ = 28638005760. Its totient is φ = 14002761600.

The previous prime is 20650636613. The next prime is 20650636637. The reversal of 20650636615 is 51663605602.

It is a happy number.

It is not a de Polignac number, because 20650636615 - 2¹ = 20650636613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650636613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1124860 + ... + 1143070.

It is an arithmetic number, because the mean of its divisors is an integer number (894937680).

Almost surely, 2^20650636615 is an apocalyptic number.

20650636615 is a deficient number, since it is larger than the sum of its proper divisors (7987369145).

20650636615 is a wasteful number, since it uses less digits than its factorization.

20650636615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18583.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 20650636615 in words is "twenty billion, six hundred fifty million, six hundred thirty-six thousand, six hundred fifteen".