20621041650 has 432 divisors, whose sum is σ = 66137329440. Its totient is φ = 4552243200.

The previous prime is 20621041631. The next prime is 20621041657. The reversal of 20621041650 is 5614012602.

20621041650 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 1 + 0 + 4 + 1 + 650 = 666.

It is not an unprimeable number, because it can be changed into a prime (20621041657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 115201261 + ... + 115201439.

It is an arithmetic number, because the mean of its divisors is an integer number (153095670).

Almost surely, 2^20621041650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621041650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33068664720).

20621041650 is an abundant number, since it is smaller than the sum of its proper divisors (45516287790).

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

20621041650 is a wasteful number, since it uses less digits than its factorization.

20621041650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 20621041650 in words is "twenty billion, six hundred twenty-one million, forty-one thousand, six hundred fifty".