20451260 has 24 divisors (see below), whose sum is σ = 43136016. Its totient is φ = 8144640.

The previous prime is 20451259. The next prime is 20451271. The reversal of 20451260 is 6215402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 7.

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 7 ways as a sum of consecutive naturals, for example, 2699 + ... + 6941.

It is an arithmetic number, because the mean of its divisors is an integer number (1797334).

Almost surely, 2^20451260 is an apocalyptic number.

20451260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451260 is an abundant number, since it is smaller than the sum of its proper divisors (22684756).

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

20451260 is a wasteful number, since it uses less digits than its factorization.

20451260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493 (or 4491 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20451260 is about 4522.3069334135. The cubic root of 20451260 is about 273.4681105432.

Adding to 20451260 its reverse (6215402), we get a palindrome (26666662).

The spelling of 20451260 in words is "twenty million, four hundred fifty-one thousand, two hundred sixty".