20009971297 has 4 divisors (see below), whose sum is σ = 20011435200. Its totient is φ = 20008507396.

The previous prime is 20009971259. The next prime is 20009971301. The reversal of 20009971297 is 79217990002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79217990002 = 2 ⋅39608995001.

It is a cyclic number.

It is not a de Polignac number, because 20009971297 - 2⁷ = 20009971169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20009971207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711253 + ... + 738850.

It is an arithmetic number, because the mean of its divisors is an integer number (5002858800).

Almost surely, 2^20009971297 is an apocalyptic number.

It is an amenable number.

20009971297 is a deficient number, since it is larger than the sum of its proper divisors (1463903).

20009971297 is a wasteful number, since it uses less digits than its factorization.

20009971297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463902.

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 20009971297 in words is "twenty billion, nine million, nine hundred seventy-one thousand, two hundred ninety-seven".