20758635557 has 16 divisors (see below), whose sum is σ = 23163008832. Its totient is φ = 18443243520.

The previous prime is 20758635529. The next prime is 20758635607. The reversal of 20758635557 is 75553685702.

It is a cyclic number.

It is not a de Polignac number, because 20758635557 - 2⁸ = 20758635301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20758635499 and 20758635508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20758634557) 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 in 15 ways as a sum of consecutive naturals, for example, 80558 + ... + 219104.

It is an arithmetic number, because the mean of its divisors is an integer number (1447688052).

Almost surely, 2^20758635557 is an apocalyptic number.

It is an amenable number.

20758635557 is a deficient number, since it is larger than the sum of its proper divisors (2404373275).

20758635557 is a wasteful number, since it uses less digits than its factorization.

20758635557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138868.

The product of its (nonzero) digits is 8820000, while the sum is 53.

The spelling of 20758635557 in words is "twenty billion, seven hundred fifty-eight million, six hundred thirty-five thousand, five hundred fifty-seven".