20826375391290 has 384 divisors, whose sum is σ = 64416459644928. Its totient is φ = 4273780008960.

The previous prime is 20826375391243. The next prime is 20826375391291. The reversal of 20826375391290 is 9219357362802.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20826375391290.

It is not an unprimeable number, because it can be changed into a prime (20826375391291) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 210891225 + ... + 210989955.

It is an arithmetic number, because the mean of its divisors is an integer number (167751196992).

Almost surely, 2^{20826375391290} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20826375391290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32208229822464).

20826375391290 is an abundant number, since it is smaller than the sum of its proper divisors (43590084253638).

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

20826375391290 is a wasteful number, since it uses less digits than its factorization.

20826375391290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99162 (or 99155 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 20826375391290 in words is "twenty trillion, eight hundred twenty-six billion, three hundred seventy-five million, three hundred ninety-one thousand, two hundred ninety".