20502018545 has 16 divisors (see below), whose sum is σ = 24681821520. Its totient is φ = 16348760064.

The previous prime is 20502018539. The next prime is 20502018577. The reversal of 20502018545 is 54581020502.

It can be written as a sum of positive squares in 8 ways, for example, as 858314209 + 19643704336 = 29297^2 + 140156^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502018545 - 2¹⁰ = 20502017521 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2493401 + ... + 2501609.

It is an arithmetic number, because the mean of its divisors is an integer number (1542613845).

Almost surely, 2^20502018545 is an apocalyptic number.

It is an amenable number.

20502018545 is a deficient number, since it is larger than the sum of its proper divisors (4179802975).

20502018545 is a wasteful number, since it uses less digits than its factorization.

20502018545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 20502018545 in words is "twenty billion, five hundred two million, eighteen thousand, five hundred forty-five".