20907987606 has 72 divisors (see below), whose sum is σ = 50052267720. Its totient is φ = 6302799360.

The previous prime is 20907987587. The next prime is 20907987637. The reversal of 20907987606 is 60678970902.

20907987606 is a `hidden beast` number, since 20 + 9 + 0 + 7 + 9 + 8 + 7 + 606 = 666.

It is a super-2 number, since 2×20907987606² (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 35 ways as a sum of consecutive naturals, for example, 395485 + ... + 445223.

It is an arithmetic number, because the mean of its divisors is an integer number (695170385).

Almost surely, 2^20907987606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20907987606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25026133860).

20907987606 is an abundant number, since it is smaller than the sum of its proper divisors (29144280114).

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

20907987606 is a wasteful number, since it uses less digits than its factorization.

20907987606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49962 (or 49948 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 20907987606 in words is "twenty billion, nine hundred seven million, nine hundred eighty-seven thousand, six hundred six".