51451020 has 36 divisors (see below), whose sum is σ = 156068640. Its totient is φ = 13720224.

The previous prime is 51451003. The next prime is 51451021. The reversal of 51451020 is 2015415.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51450984 and 51451002.

It is not an unprimeable number, because it can be changed into a prime (51451021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142740 + ... + 143099.

It is an arithmetic number, because the mean of its divisors is an integer number (4335240).

Almost surely, 2^51451020 is an apocalyptic number.

It is an amenable number.

51451020 is an abundant number, since it is smaller than the sum of its proper divisors (104617620).

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

51451020 is a wasteful number, since it uses less digits than its factorization.

51451020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285854 (or 285849 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51451020 is about 7172.9366371104. The cubic root of 51451020 is about 371.9329570474.

Adding to 51451020 its reverse (2015415), we get a palindrome (53466435).

The spelling of 51451020 in words is "fifty-one million, four hundred fifty-one thousand, twenty".