20606215616 has 112 divisors (see below), whose sum is σ = 49378575360. Its totient is φ = 8334627840.

The previous prime is 20606215607. The next prime is 20606215681. The reversal of 20606215616 is 61651260602.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×20606215616² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2302286 + ... + 2311218.

Almost surely, 2^20606215616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20606215616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24689287680).

20606215616 is an abundant number, since it is smaller than the sum of its proper divisors (28772359744).

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

20606215616 is a wasteful number, since it uses less digits than its factorization.

20606215616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242 (or 9232 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 20606215616 in words is "twenty billion, six hundred six million, two hundred fifteen thousand, six hundred sixteen".