51204220 has 12 divisors (see below), whose sum is σ = 107528904. Its totient is φ = 20481680.

The previous prime is 51204211. The next prime is 51204229. The reversal of 51204220 is 2240215.

It is an interprime number because it is at equal distance from previous prime (51204211) and next prime (51204229).

It is a junction number, because it is equal to n+sod(n) for n = 51204194 and 51204203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51204229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280086 + ... + 1280125.

It is an arithmetic number, because the mean of its divisors is an integer number (8960742).

Almost surely, 2^51204220 is an apocalyptic number.

It is an amenable number.

51204220 is an abundant number, since it is smaller than the sum of its proper divisors (56324684).

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

51204220 is a wasteful number, since it uses less digits than its factorization.

51204220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560220 (or 2560218 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 51204220 is about 7155.7124033879. The cubic root of 51204220 is about 371.3373082342.

Adding to 51204220 its reverse (2240215), we get a palindrome (53444435).

The spelling of 51204220 in words is "fifty-one million, two hundred four thousand, two hundred twenty".