20953598389 has 8 divisors (see below), whose sum is σ = 21351573432. Its totient is φ = 20555720640.

The previous prime is 20953598377. The next prime is 20953598401. The reversal of 20953598389 is 98389535902.

It is an interprime number because it is at equal distance from previous prime (20953598377) and next prime (20953598401).

It can be written as a sum of positive squares in 4 ways, for example, as 12765158289 + 8188440100 = 112983^2 + 90490^2 .

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 20953598389 - 2⁵ = 20953598357 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 (20953598789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528519 + ... + 566779.

It is an arithmetic number, because the mean of its divisors is an integer number (2668946679).

Almost surely, 2^20953598389 is an apocalyptic number.

It is an amenable number.

20953598389 is a deficient number, since it is larger than the sum of its proper divisors (397975043).

20953598389 is a wasteful number, since it uses less digits than its factorization.

20953598389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48647.

The product of its (nonzero) digits is 20995200, while the sum is 61.

The spelling of 20953598389 in words is "twenty billion, nine hundred fifty-three million, five hundred ninety-eight thousand, three hundred eighty-nine".