20081493 has 16 divisors (see below), whose sum is σ = 29852160. Its totient is φ = 13341888.

The previous prime is 20081483. The next prime is 20081519. The reversal of 20081493 is 39418002.

It is not a de Polignac number, because 20081493 - 2⁶ = 20081429 is a prime.

It is a super-2 number, since 2×20081493² = 806532722218098, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20081483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7996 + ... + 10202.

It is an arithmetic number, because the mean of its divisors is an integer number (1865760).

Almost surely, 2^20081493 is an apocalyptic number.

It is an amenable number.

20081493 is a deficient number, since it is larger than the sum of its proper divisors (9770667).

20081493 is a wasteful number, since it uses less digits than its factorization.

20081493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20081493 is about 4481.2378870129. The cubic root of 20081493 is about 271.8099387718.

Adding to 20081493 its reverse (39418002), we get a palindrome (59499495).

The spelling of 20081493 in words is "twenty million, eighty-one thousand, four hundred ninety-three".