281400020 has 90 divisors (see below), whose sum is σ = 671675130. Its totient is φ = 99026400.

The previous prime is 281400019. The next prime is 281400029. The reversal of 281400020 is 20004182.

It can be written as a sum of positive squares in only one way, i.e., 225120016 + 56280004 = 15004^2 + 7502^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281400029) 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 29 ways as a sum of consecutive naturals, for example, 9077405 + ... + 9077435.

It is an arithmetic number, because the mean of its divisors is an integer number (7463057).

Almost surely, 2^281400020 is an apocalyptic number.

281400020 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 281400020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335837565).

281400020 is an abundant number, since it is smaller than the sum of its proper divisors (390275110).

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

281400020 is an equidigital number, since it uses as much as digits as its factorization.

281400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 281400020 is about 16774.9819672034. The cubic root of 281400020 is about 655.3018207714.

The spelling of 281400020 in words is "two hundred eighty-one million, four hundred thousand, twenty".