20608969780 has 384 divisors, whose sum is σ = 57480192000. Its totient is φ = 6164121600.

The previous prime is 20608969757. The next prime is 20608969817. The reversal of 20608969780 is 8796980602.

It is a congruent 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 127 ways as a sum of consecutive naturals, for example, 157320315 + ... + 157320445.

It is an arithmetic number, because the mean of its divisors is an integer number (149688000).

Almost surely, 2^20608969780 is an apocalyptic number.

20608969780 is a gapful number since it is divisible by the number (20) 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 20608969780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28740096000).

20608969780 is an abundant number, since it is smaller than the sum of its proper divisors (36871222220).

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

20608969780 is a wasteful number, since it uses less digits than its factorization.

20608969780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 20608969780 in words is "twenty billion, six hundred eight million, nine hundred sixty-nine thousand, seven hundred eighty".