20381460 has 48 divisors (see below), whose sum is σ = 62258112. Its totient is φ = 4940800.

The previous prime is 20381443. The next prime is 20381479. The reversal of 20381460 is 6418302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20381460.

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, 14781 + ... + 16100.

It is an arithmetic number, because the mean of its divisors is an integer number (1297044).

Almost surely, 2^20381460 is an apocalyptic number.

20381460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20381460 is an abundant number, since it is smaller than the sum of its proper divisors (41876652).

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

20381460 is a wasteful number, since it uses less digits than its factorization.

20381460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30904 (or 30902 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20381460 is about 4514.5830372250. The cubic root of 20381460 is about 273.1566410428.

Adding to 20381460 its reverse (6418302), we get a palindrome (26799762).

The spelling of 20381460 in words is "twenty million, three hundred eighty-one thousand, four hundred sixty".