20706790307840 has 384 divisors, whose sum is σ = 61183177735680. Its totient is φ = 6549774925824.

The previous prime is 20706790307807. The next prime is 20706790307851. The reversal of 20706790307840 is 4870309760702.

It is a congruent number.

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, 2090112167 + ... + 2090122073.

It is an arithmetic number, because the mean of its divisors is an integer number (159331192020).

Almost surely, 2^{20706790307840} is an apocalyptic number.

20706790307840 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 20706790307840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30591588867840).

20706790307840 is an abundant number, since it is smaller than the sum of its proper divisors (40476387427840).

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

20706790307840 is a wasteful number, since it uses less digits than its factorization.

20706790307840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12197 (or 12177 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 53.

The spelling of 20706790307840 in words is "twenty trillion, seven hundred six billion, seven hundred ninety million, three hundred seven thousand, eight hundred forty".