18946893644 has 24 divisors (see below), whose sum is σ = 37896720288. Its totient is φ = 8119468800.

The previous prime is 18946893583. The next prime is 18946893649. The reversal of 18946893644 is 44639864981.

It is not an unprimeable number, because it can be changed into a prime (18946893649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634244 + ... + 663444.

It is an arithmetic number, because the mean of its divisors is an integer number (1579030012).

Almost surely, 2^18946893644 is an apocalyptic number.

18946893644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18946893644 is an abundant number, since it is smaller than the sum of its proper divisors (18949826644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18946893644 is a wasteful number, since it uses less digits than its factorization.

18946893644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52385 (or 52383 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 62.

The spelling of 18946893644 in words is "eighteen billion, nine hundred forty-six million, eight hundred ninety-three thousand, six hundred forty-four".