20695897665 has 48 divisors (see below), whose sum is σ = 38550066048. Its totient is φ = 10233451008.

The previous prime is 20695897661. The next prime is 20695897667. The reversal of 20695897665 is 56679859602.

It is not a de Polignac number, because 20695897665 - 2² = 20695897661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20695897661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150637 + ... + 253146.

It is an arithmetic number, because the mean of its divisors is an integer number (803126376).

Almost surely, 2^20695897665 is an apocalyptic number.

It is an amenable number.

20695897665 is a deficient number, since it is larger than the sum of its proper divisors (17854168383).

20695897665 is a wasteful number, since it uses less digits than its factorization.

20695897665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403878 (or 403875 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 20695897665 in words is "twenty billion, six hundred ninety-five million, eight hundred ninety-seven thousand, six hundred sixty-five".