51310020 has 48 divisors (see below), whose sum is σ = 145107648. Its totient is φ = 13545600.

The previous prime is 51310003. The next prime is 51310027. The reversal of 51310020 is 2001315.

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

It is a junction number, because it is equal to n+sod(n) for n = 51309978 and 51310005.

It is not an unprimeable number, because it can be changed into a prime (51310027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (3023076).

Almost surely, 2^51310020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72553824).

51310020 is an abundant number, since it is smaller than the sum of its proper divisors (93797628).

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

51310020 is a wasteful number, since it uses less digits than its factorization.

51310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580 (or 8578 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 51310020 is about 7163.1012836620. The cubic root of 51310020 is about 371.5928891164.

Adding to 51310020 its reverse (2001315), we get a palindrome (53311335).

The spelling of 51310020 in words is "fifty-one million, three hundred ten thousand, twenty".