20807670197 has 4 divisors (see below), whose sum is σ = 20818019136. Its totient is φ = 20797321260.

The previous prime is 20807670193. The next prime is 20807670209. The reversal of 20807670197 is 79107670802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20807670197 - 2² = 20807670193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20807670193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171453 + ... + 5175474.

It is an arithmetic number, because the mean of its divisors is an integer number (5204504784).

Almost surely, 2^20807670197 is an apocalyptic number.

It is an amenable number.

20807670197 is a deficient number, since it is larger than the sum of its proper divisors (10348939).

20807670197 is a wasteful number, since it uses less digits than its factorization.

20807670197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10348938.

The product of its (nonzero) digits is 296352, while the sum is 47.

The spelling of 20807670197 in words is "twenty billion, eight hundred seven million, six hundred seventy thousand, one hundred ninety-seven".