20923397226856 has 128 divisors (see below), whose sum is σ = 42628890276000. Its totient is φ = 9590737960960.

The previous prime is 20923397226833. The next prime is 20923397226931. The reversal of 20923397226856 is 65862279332902.

It can be written as a sum of positive squares in 16 ways, for example, as 2374268029956 + 18549129196900 = 1540866^2 + 4306870^2 .

It is a super-2 number, since 2×20923397226856² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

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, 2814929316 + ... + 2814936748.

Almost surely, 2^{20923397226856} is an apocalyptic number.

It is an amenable number.

20923397226856 is an abundant number, since it is smaller than the sum of its proper divisors (21705493049144).

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

20923397226856 is a wasteful number, since it uses less digits than its factorization.

20923397226856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10279 (or 10275 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 64.

The spelling of 20923397226856 in words is "twenty trillion, nine hundred twenty-three billion, three hundred ninety-seven million, two hundred twenty-six thousand, eight hundred fifty-six".