20708455680 has 1152 divisors, whose sum is σ = 87594393600. Its totient is φ = 4578508800.

The previous prime is 20708455631. The next prime is 20708455717. The reversal of 20708455680 is 8655480702.

20708455680 is a `hidden beast` number, since 2 + 0 + 7 + 0 + 84 + 5 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 339482850 + ... + 339482910.

It is an arithmetic number, because the mean of its divisors is an integer number (76036800).

Almost surely, 2^20708455680 is an apocalyptic number.

20708455680 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 20708455680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43797196800).

20708455680 is an abundant number, since it is smaller than the sum of its proper divisors (66885937920).

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

20708455680 is a wasteful number, since it uses less digits than its factorization.

20708455680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 20708455680 in words is "twenty billion, seven hundred eight million, four hundred fifty-five thousand, six hundred eighty".