20543341857 has 16 divisors (see below), whose sum is σ = 28278523392. Its totient is φ = 13251980160.

The previous prime is 20543341849. The next prime is 20543341859. The reversal of 20543341857 is 75814334502.

It is not a de Polignac number, because 20543341857 - 2³ = 20543341849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20543341859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1271373 + ... + 1287429.

It is an arithmetic number, because the mean of its divisors is an integer number (1767407712).

Almost surely, 2^20543341857 is an apocalyptic number.

It is an amenable number.

20543341857 is a deficient number, since it is larger than the sum of its proper divisors (7735181535).

20543341857 is a wasteful number, since it uses less digits than its factorization.

20543341857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29848.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 20543341857 in words is "twenty billion, five hundred forty-three million, three hundred forty-one thousand, eight hundred fifty-seven".