20505355541 has 32 divisors (see below), whose sum is σ = 24056524800. Its totient is φ = 17280622080.

The previous prime is 20505355537. The next prime is 20505355547. The reversal of 20505355541 is 14555350502.

It is a cyclic number.

It is not a de Polignac number, because 20505355541 - 2² = 20505355537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505355547) 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 31 ways as a sum of consecutive naturals, for example, 2746085 + ... + 2753541.

It is an arithmetic number, because the mean of its divisors is an integer number (751766400).

Almost surely, 2^20505355541 is an apocalyptic number.

It is an amenable number.

20505355541 is a deficient number, since it is larger than the sum of its proper divisors (3551169259).

20505355541 is a wasteful number, since it uses less digits than its factorization.

20505355541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7769.

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 20505355541 in words is "twenty billion, five hundred five million, three hundred fifty-five thousand, five hundred forty-one".