20953598377 has 2 divisors, whose sum is σ = 20953598378. Its totient is φ = 20953598376.

The previous prime is 20953598357. The next prime is 20953598401. The reversal of 20953598377 is 77389535902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15348979881 + 5604618496 = 123891^2 + 74864^2 .

It is a cyclic number.

It is not a de Polignac number, because 20953598377 - 2¹⁵ = 20953565609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20953598357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476799188 + 10476799189.

It is an arithmetic number, because the mean of its divisors is an integer number (10476799189).

Almost surely, 2^20953598377 is an apocalyptic number.

It is an amenable number.

20953598377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20953598377 is an equidigital number, since it uses as much as digits as its factorization.

20953598377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 20953598377 in words is "twenty billion, nine hundred fifty-three million, five hundred ninety-eight thousand, three hundred seventy-seven".