20857731133 has 2 divisors, whose sum is σ = 20857731134. Its totient is φ = 20857731132.

The previous prime is 20857731119. The next prime is 20857731143. The reversal of 20857731133 is 33113775802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14894493849 + 5963237284 = 122043^2 + 77222^2 .

It is a cyclic number.

It is not a de Polignac number, because 20857731133 - 2⁵ = 20857731101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20857731143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428865566 + 10428865567.

It is an arithmetic number, because the mean of its divisors is an integer number (10428865567).

Almost surely, 2^20857731133 is an apocalyptic number.

It is an amenable number.

20857731133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20857731133 is an equidigital number, since it uses as much as digits as its factorization.

20857731133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 20857731133 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirty-one thousand, one hundred thirty-three".