20543355215 has 16 divisors (see below), whose sum is σ = 25186054656. Its totient is φ = 16081459200.

The previous prime is 20543355197. The next prime is 20543355223. The reversal of 20543355215 is 51255334502.

It is a de Polignac number, because none of the positive numbers 2^k-20543355215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115631 + ... + 233360.

It is an arithmetic number, because the mean of its divisors is an integer number (1574128416).

Almost surely, 2^20543355215 is an apocalyptic number.

20543355215 is a deficient number, since it is larger than the sum of its proper divisors (4642699441).

20543355215 is a wasteful number, since it uses less digits than its factorization.

20543355215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349250.

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 20543355215 its reverse (51255334502), we get a palindrome (71798689717).

The spelling of 20543355215 in words is "twenty billion, five hundred forty-three million, three hundred fifty-five thousand, two hundred fifteen".