20533188197 has 2 divisors, whose sum is σ = 20533188198. Its totient is φ = 20533188196.

The previous prime is 20533188187. The next prime is 20533188209. The reversal of 20533188197 is 79188133502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16622687041 + 3910501156 = 128929^2 + 62534^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533188197 - 2¹⁶ = 20533122661 is a prime.

It is a super-2 number, since 2×20533188197² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20533188167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266594098 + 10266594099.

It is an arithmetic number, because the mean of its divisors is an integer number (10266594099).

Almost surely, 2^20533188197 is an apocalyptic number.

It is an amenable number.

20533188197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533188197 is an equidigital number, since it uses as much as digits as its factorization.

20533188197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 20533188197 in words is "twenty billion, five hundred thirty-three million, one hundred eighty-eight thousand, one hundred ninety-seven".