20969420616 has 96 divisors (see below), whose sum is σ = 59641545600. Its totient is φ = 6901277760.

The previous prime is 20969420581. The next prime is 20969420621. The reversal of 20969420616 is 61602496902.

20969420616 is a `hidden beast` number, since 2 + 0 + 9 + 6 + 9 + 4 + 20 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85306 + ... + 221846.

It is an arithmetic number, because the mean of its divisors is an integer number (621266100).

Almost surely, 2^20969420616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20969420616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29820772800).

20969420616 is an abundant number, since it is smaller than the sum of its proper divisors (38672124984).

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

20969420616 is a wasteful number, since it uses less digits than its factorization.

20969420616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136641 (or 136625 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 20969420616 in words is "twenty billion, nine hundred sixty-nine million, four hundred twenty thousand, six hundred sixteen".