20786355984 has 160 divisors (see below), whose sum is σ = 61017523200. Its totient is φ = 6062031360.

The previous prime is 20786355959. The next prime is 20786356009. The reversal of 20786355984 is 48955368702.

It is an interprime number because it is at equal distance from previous prime (20786355959) and next prime (20786356009).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 591219 + ... + 625389.

It is an arithmetic number, because the mean of its divisors is an integer number (381359520).

Almost surely, 2^20786355984 is an apocalyptic number.

20786355984 is a gapful number since it is divisible by the number (24) 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 20786355984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30508761600).

20786355984 is an abundant number, since it is smaller than the sum of its proper divisors (40231167216).

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

20786355984 is a wasteful number, since it uses less digits than its factorization.

20786355984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34253 (or 34247 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 20786355984 in words is "twenty billion, seven hundred eighty-six million, three hundred fifty-five thousand, nine hundred eighty-four".