20643541197 has 8 divisors (see below), whose sum is σ = 27797244000. Its totient is φ = 13626099600.

The previous prime is 20643541157. The next prime is 20643541199. The reversal of 20643541197 is 79114534602.

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

It is not a de Polignac number, because 20643541197 - 2⁸ = 20643540941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643541199) 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, 34064947 + ... + 34065552.

It is an arithmetic number, because the mean of its divisors is an integer number (3474655500).

Almost surely, 2^20643541197 is an apocalyptic number.

It is an amenable number.

20643541197 is a deficient number, since it is larger than the sum of its proper divisors (7153702803).

20643541197 is a wasteful number, since it uses less digits than its factorization.

20643541197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68130603.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 20643541197 in words is "twenty billion, six hundred forty-three million, five hundred forty-one thousand, one hundred ninety-seven".