20935896557 has 8 divisors (see below), whose sum is σ = 21002673120. Its totient is φ = 20869177680.

The previous prime is 20935896547. The next prime is 20935896563. The reversal of 20935896557 is 75569853902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20935896557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20935896496 and 20935896505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20935896547) 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, 781694 + ... + 808032.

It is an arithmetic number, because the mean of its divisors is an integer number (2625334140).

Almost surely, 2^20935896557 is an apocalyptic number.

It is an amenable number.

20935896557 is a deficient number, since it is larger than the sum of its proper divisors (66776563).

20935896557 is a wasteful number, since it uses less digits than its factorization.

20935896557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843.

The product of its (nonzero) digits is 20412000, while the sum is 59.

The spelling of 20935896557 in words is "twenty billion, nine hundred thirty-five million, eight hundred ninety-six thousand, five hundred fifty-seven".