20051400 has 96 divisors (see below), whose sum is σ = 64906560. Its totient is φ = 5111040.

The previous prime is 20051363. The next prime is 20051407. The reversal of 20051400 is 415002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20051407) 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 23 ways as a sum of consecutive naturals, for example, 13074 + ... + 14526.

It is an arithmetic number, because the mean of its divisors is an integer number (676110).

Almost surely, 2^20051400 is an apocalyptic number.

20051400 is a gapful number since it is divisible by the number (20) 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 20051400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32453280).

20051400 is an abundant number, since it is smaller than the sum of its proper divisors (44855160).

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

20051400 is a wasteful number, since it uses less digits than its factorization.

20051400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495 (or 1486 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20051400 is about 4477.8789621873. The cubic root of 20051400 is about 271.6740978475.

Adding to 20051400 its reverse (415002), we get a palindrome (20466402).

The spelling of 20051400 in words is "twenty million, fifty-one thousand, four hundred".