20122543345 has 16 divisors (see below), whose sum is σ = 24987690000. Its totient is φ = 15537964288.

The previous prime is 20122543339. The next prime is 20122543349. The reversal of 20122543345 is 54334522102.

It can be written as a sum of positive squares in 8 ways, for example, as 987907761 + 19134635584 = 31431^2 + 138328^2 .

It is not a de Polignac number, because 20122543345 - 2¹¹ = 20122541297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20122543349) by changing a digit.

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, 470931 + ... + 511879.

It is an arithmetic number, because the mean of its divisors is an integer number (1561730625).

Almost surely, 2^20122543345 is an apocalyptic number.

It is an amenable number.

20122543345 is a deficient number, since it is larger than the sum of its proper divisors (4865146655).

20122543345 is a wasteful number, since it uses less digits than its factorization.

20122543345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44372.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 20122543345 in words is "twenty billion, one hundred twenty-two million, five hundred forty-three thousand, three hundred forty-five".