18820494 has 96 divisors (see below), whose sum is σ = 52356096. Its totient is φ = 4743360.

The previous prime is 18820493. The next prime is 18820519. The reversal of 18820494 is 49402881.

18820494 = T₇₇ + T₇₈ + ... + T₄₈₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51099 + ... + 51465.

It is an arithmetic number, because the mean of its divisors is an integer number (545376).

Almost surely, 2^18820494 is an apocalyptic number.

18820494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18820494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26178048).

18820494 is an abundant number, since it is smaller than the sum of its proper divisors (33535602).

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

18820494 is a wasteful number, since it uses less digits than its factorization.

18820494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18820494 is about 4338.2593283482. The cubic root of 18820494 is about 265.9971639323.

The spelling of 18820494 in words is "eighteen million, eight hundred twenty thousand, four hundred ninety-four".