20861971695 has 12 divisors (see below), whose sum is σ = 36160751016. Its totient is φ = 11126384880.

The previous prime is 20861971679. The next prime is 20861971723. The reversal of 20861971695 is 59617916802.

20861971695 is a `hidden beast` number, since 2 + 0 + 8 + 619 + 7 + 16 + 9 + 5 = 666.

It is not a de Polignac number, because 20861971695 - 2⁴ = 20861971679 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231799641 + ... + 231799730.

It is an arithmetic number, because the mean of its divisors is an integer number (3013395918).

Almost surely, 2^20861971695 is an apocalyptic number.

20861971695 is a deficient number, since it is larger than the sum of its proper divisors (15298779321).

20861971695 is a wasteful number, since it uses less digits than its factorization.

20861971695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463599382 (or 463599379 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 20861971695 in words is "twenty billion, eight hundred sixty-one million, nine hundred seventy-one thousand, six hundred ninety-five".