51006220 has 24 divisors (see below), whose sum is σ = 107531424. Its totient is φ = 20322816.

The previous prime is 51006217. The next prime is 51006289. The reversal of 51006220 is 2260015.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51006194 and 51006203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412 + ... + 10108.

It is an arithmetic number, because the mean of its divisors is an integer number (4480476).

Almost surely, 2^51006220 is an apocalyptic number.

It is an amenable number.

51006220 is an abundant number, since it is smaller than the sum of its proper divisors (56525204).

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

51006220 is a wasteful number, since it uses less digits than its factorization.

51006220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969 (or 9967 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51006220 is about 7141.8639023717. The cubic root of 51006220 is about 370.8580524139.

Adding to 51006220 its reverse (2260015), we get a palindrome (53266235).

The spelling of 51006220 in words is "fifty-one million, six thousand, two hundred twenty".