20502018523 has 16 divisors (see below), whose sum is σ = 23544483840. Its totient is φ = 17488152000.

The previous prime is 20502018521. The next prime is 20502018527. The reversal of 20502018523 is 32581020502.

It is a cyclic number.

It is not a de Polignac number, because 20502018523 - 2¹ = 20502018521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20502018491 and 20502018500.

It is not an unprimeable number, because it can be changed into a prime (20502018521) 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, 1310598 + ... + 1326148.

It is an arithmetic number, because the mean of its divisors is an integer number (1471530240).

Almost surely, 2^20502018523 is an apocalyptic number.

20502018523 is a deficient number, since it is larger than the sum of its proper divisors (3042465317).

20502018523 is a wasteful number, since it uses less digits than its factorization.

20502018523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16458.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 20502018523 in words is "twenty billion, five hundred two million, eighteen thousand, five hundred twenty-three".