18924490436 has 54 divisors (see below), whose sum is σ = 35120150730. Its totient is φ = 8920917632.

The previous prime is 18924490433. The next prime is 18924490463. The reversal of 18924490436 is 63409442981.

It can be written as a sum of positive squares in 3 ways, for example, as 1869697600 + 17054792836 = 43240^2 + 130594^2 .

It is not an unprimeable number, because it can be changed into a prime (18924490433) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 59698550 + ... + 59698866.

Almost surely, 2^18924490436 is an apocalyptic number.

It is an amenable number.

18924490436 is a deficient number, since it is larger than the sum of its proper divisors (16195660294).

18924490436 is an equidigital number, since it uses as much as digits as its factorization.

18924490436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 18924490436 in words is "eighteen billion, nine hundred twenty-four million, four hundred ninety thousand, four hundred thirty-six".