20702381856 has 192 divisors, whose sum is σ = 62820188928. Its totient is φ = 5912690688.

The previous prime is 20702381837. The next prime is 20702381867. The reversal of 20702381856 is 65818320702.

It is a super-2 number, since 2×20702381856² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1542085 + ... + 1555451.

It is an arithmetic number, because the mean of its divisors is an integer number (327188484).

Almost surely, 2^20702381856 is an apocalyptic number.

20702381856 is a gapful number since it is divisible by the number (26) 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 20702381856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31410094464).

20702381856 is an abundant number, since it is smaller than the sum of its proper divisors (42117807072).

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

20702381856 is a wasteful number, since it uses less digits than its factorization.

20702381856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13483 (or 13475 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 20702381856 in words is "twenty billion, seven hundred two million, three hundred eighty-one thousand, eight hundred fifty-six".