51200420 has 12 divisors (see below), whose sum is σ = 107520924. Its totient is φ = 20480160.

The previous prime is 51200417. The next prime is 51200441. The reversal of 51200420 is 2400215.

It can be written as a sum of positive squares in 2 ways, for example, as 6390784 + 44809636 = 2528^2 + 6694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51200395 and 51200404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279991 + ... + 1280030.

It is an arithmetic number, because the mean of its divisors is an integer number (8960077).

Almost surely, 2^51200420 is an apocalyptic number.

It is an amenable number.

51200420 is an abundant number, since it is smaller than the sum of its proper divisors (56320504).

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

51200420 is a wasteful number, since it uses less digits than its factorization.

51200420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560030 (or 2560028 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 51200420 is about 7155.4468763313. The cubic root of 51200420 is about 371.3281220338.

Adding to 51200420 its reverse (2400215), we get a palindrome (53600635).

The spelling of 51200420 in words is "fifty-one million, two hundred thousand, four hundred twenty".