20912863650 has 144 divisors (see below), whose sum is σ = 62965690176. Its totient is φ = 4498836480.

The previous prime is 20912863619. The next prime is 20912863661. The reversal of 20912863650 is 5636821902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 268992 + ... + 337908.

Almost surely, 2^20912863650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20912863650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31482845088).

20912863650 is an abundant number, since it is smaller than the sum of its proper divisors (42052826526).

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

20912863650 is a wasteful number, since it uses less digits than its factorization.

20912863650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68973 (or 68951 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 20912863650 in words is "twenty billion, nine hundred twelve million, eight hundred sixty-three thousand, six hundred fifty".