20461280 has 48 divisors (see below), whose sum is σ = 55248480. Its totient is φ = 7014912.

The previous prime is 20461279. The next prime is 20461297. The reversal of 20461280 is 8216402.

It is a super-3 number, since 3×20461280³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8015 + ... + 10254.

It is an arithmetic number, because the mean of its divisors is an integer number (1151010).

Almost surely, 2^20461280 is an apocalyptic number.

20461280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20461280 is an abundant number, since it is smaller than the sum of its proper divisors (34787200).

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

20461280 is a wasteful number, since it uses less digits than its factorization.

20461280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291 (or 18283 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20461280 is about 4523.4146394068. The cubic root of 20461280 is about 273.5127647288.

Adding to 20461280 its reverse (8216402), we get a palindrome (28677682).

The spelling of 20461280 in words is "twenty million, four hundred sixty-one thousand, two hundred eighty".