20847339275840 has 448 divisors, whose sum is σ = 62839689408000. Its totient is φ = 6398685020160.

The previous prime is 20847339275809. The next prime is 20847339275909. The reversal of 20847339275840 is 4857293374802.

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×20847339275840² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1174555286 + ... + 1174573034.

Almost surely, 2^{20847339275840} is an apocalyptic number.

20847339275840 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 20847339275840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31419844704000).

20847339275840 is an abundant number, since it is smaller than the sum of its proper divisors (41992350132160).

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

20847339275840 is a wasteful number, since it uses less digits than its factorization.

20847339275840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18510 (or 18500 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 62.

The spelling of 20847339275840 in words is "twenty trillion, eight hundred forty-seven billion, three hundred thirty-nine million, two hundred seventy-five thousand, eight hundred forty".