20071621636 has 24 divisors (see below), whose sum is σ = 39639882240. Its totient is φ = 8808861600.

The previous prime is 20071621631. The next prime is 20071621651. The reversal of 20071621636 is 63612617002.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20071621631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7863780 + ... + 7866331.

It is an arithmetic number, because the mean of its divisors is an integer number (1651661760).

Almost surely, 2^20071621636 is an apocalyptic number.

It is an amenable number.

20071621636 is a deficient number, since it is larger than the sum of its proper divisors (19568260604).

20071621636 is a wasteful number, since it uses less digits than its factorization.

20071621636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15730155 (or 15730153 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 20071621636 in words is "twenty billion, seventy-one million, six hundred twenty-one thousand, six hundred thirty-six".