20835238280981 has 8 divisors (see below), whose sum is σ = 20846942386200. Its totient is φ = 20823536401920.

The previous prime is 20835238280947. The next prime is 20835238281007. The reversal of 20835238280981 is 18908283253802.

It can be written as a sum of positive squares in 4 ways, for example, as 16468588900 + 20818769692081 = 128330^2 + 4562759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20835238280981 - 2⁴² = 16437191769877 is a prime.

It is a super-2 number, since 2×20835238280981² (a number of 27 digits) contains 22 as substring.

It is a Duffinian 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 20835238280981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835238280581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18347261 + ... + 19449741.

It is an arithmetic number, because the mean of its divisors is an integer number (2605867798275).

Almost surely, 2^{20835238280981} is an apocalyptic number.

It is an amenable number.

20835238280981 is a deficient number, since it is larger than the sum of its proper divisors (11704105219).

20835238280981 is a wasteful number, since it uses less digits than its factorization.

20835238280981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113079.

The product of its (nonzero) digits is 13271040, while the sum is 59.

The spelling of 20835238280981 in words is "twenty trillion, eight hundred thirty-five billion, two hundred thirty-eight million, two hundred eighty thousand, nine hundred eighty-one".