18973920 has 96 divisors (see below), whose sum is σ = 68318208. Its totient is φ = 4336128.

The previous prime is 18973901. The next prime is 18973937. The reversal of 18973920 is 2937981.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 537 + ... + 6183.

It is an arithmetic number, because the mean of its divisors is an integer number (711648).

Almost surely, 2^18973920 is an apocalyptic number.

18973920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18973920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34159104).

18973920 is an abundant number, since it is smaller than the sum of its proper divisors (49344288).

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

18973920 is a wasteful number, since it uses less digits than its factorization.

18973920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672 (or 5664 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 18973920 is about 4355.9063350811. The cubic root of 18973920 is about 266.7180178886.

The spelling of 18973920 in words is "eighteen million, nine hundred seventy-three thousand, nine hundred twenty".