20081400 has 48 divisors (see below), whose sum is σ = 62254200. Its totient is φ = 5354880.

The previous prime is 20081393. The next prime is 20081419. The reversal of 20081400 is 418002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20081400.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16135 + ... + 17334.

Almost surely, 2^20081400 is an apocalyptic number.

20081400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20081400 is an abundant number, since it is smaller than the sum of its proper divisors (42172800).

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

20081400 is a wasteful number, since it uses less digits than its factorization.

20081400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33488 (or 33479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20081400 is about 4481.2275104038. The cubic root of 20081400 is about 271.8095191754.

Adding to 20081400 its reverse (418002), we get a palindrome (20499402).

The spelling of 20081400 in words is "twenty million, eighty-one thousand, four hundred".