20831261705 has 8 divisors (see below), whose sum is σ = 26313172800. Its totient is φ = 15787903536.

The previous prime is 20831261663. The next prime is 20831261719. The reversal of 20831261705 is 50716213802.

It is a happy number.

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 20831261705 - 2¹⁴ = 20831245321 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109638125 + ... + 109638314.

It is an arithmetic number, because the mean of its divisors is an integer number (3289146600).

Almost surely, 2^20831261705 is an apocalyptic number.

It is an amenable number.

20831261705 is a deficient number, since it is larger than the sum of its proper divisors (5481911095).

20831261705 is a wasteful number, since it uses less digits than its factorization.

20831261705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219276463.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 20831261705 in words is "twenty billion, eight hundred thirty-one million, two hundred sixty-one thousand, seven hundred five".