20920712197 has 8 divisors (see below), whose sum is σ = 26082965952. Its totient is φ = 16301853600.

The previous prime is 20920712179. The next prime is 20920712221. The reversal of 20920712197 is 79121702902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20920712197 - 2⁷ = 20920712069 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 (20920715197) 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 7 ways as a sum of consecutive naturals, for example, 135848704 + ... + 135848857.

It is an arithmetic number, because the mean of its divisors is an integer number (3260370744).

Almost surely, 2^20920712197 is an apocalyptic number.

It is an amenable number.

20920712197 is a deficient number, since it is larger than the sum of its proper divisors (5162253755).

20920712197 is a wasteful number, since it uses less digits than its factorization.

20920712197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271697579.

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 20920712197 in words is "twenty billion, nine hundred twenty million, seven hundred twelve thousand, one hundred ninety-seven".