20530002636 has 192 divisors, whose sum is σ = 62936885760. Its totient is φ = 5705406720.

The previous prime is 20530002631. The next prime is 20530002667. The reversal of 20530002636 is 63620003502.

20530002636 is a `hidden beast` number, since 20 + 5 + 3 + 0 + 0 + 0 + 2 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20530002631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2420475 + ... + 2428941.

It is an arithmetic number, because the mean of its divisors is an integer number (327796280).

Almost surely, 2^20530002636 is an apocalyptic number.

20530002636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20530002636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31468442880).

20530002636 is an abundant number, since it is smaller than the sum of its proper divisors (42406883124).

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

20530002636 is a wasteful number, since it uses less digits than its factorization.

20530002636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8661 (or 8653 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The spelling of 20530002636 in words is "twenty billion, five hundred thirty million, two thousand, six hundred thirty-six".