20691604184097 has 48 divisors (see below), whose sum is σ = 36481065313280. Its totient is φ = 10183154461920.

The previous prime is 20691604184093. The next prime is 20691604184101. The reversal of 20691604184097 is 79048140619602.

It is an interprime number because it is at equal distance from previous prime (20691604184093) and next prime (20691604184101).

It is not a de Polignac number, because 20691604184097 - 2² = 20691604184093 is a prime.

It is a super-2 number, since 2×20691604184097² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (20691604184093) 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, 214243693 + ... + 214340250.

Almost surely, 2^{20691604184097} is an apocalyptic number.

It is an amenable number.

20691604184097 is a deficient number, since it is larger than the sum of its proper divisors (15789461129183).

20691604184097 is a wasteful number, since it uses less digits than its factorization.

20691604184097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428583994 (or 428583983 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 20691604184097 in words is "twenty trillion, six hundred ninety-one billion, six hundred four million, one hundred eighty-four thousand, ninety-seven".