20506453650 has 72 divisors (see below), whose sum is σ = 55271533824. Its totient is φ = 5450767200.

The previous prime is 20506453621. The next prime is 20506453663. The reversal of 20506453650 is 5635460502.

It is a happy number.

20506453650 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 645 + 3 + 6 + 5 + 0 = 666.

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, 66687 + ... + 213213.

It is an arithmetic number, because the mean of its divisors is an integer number (767660192).

Almost surely, 2^20506453650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20506453650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27635766912).

20506453650 is an abundant number, since it is smaller than the sum of its proper divisors (34765080174).

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

20506453650 is a wasteful number, since it uses less digits than its factorization.

20506453650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146856 (or 146848 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 20506453650 in words is "twenty billion, five hundred six million, four hundred fifty-three thousand, six hundred fifty".