51242020 has 24 divisors (see below), whose sum is σ = 107743104. Its totient is φ = 20471136.

The previous prime is 51241991. The next prime is 51242027. The reversal of 51242020 is 2024215.

It is a super-2 number, since 2×51242020² = 5251489227360800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51241985 and 51242003.

It is not an unprimeable number, because it can be changed into a prime (51242027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28879 + ... + 30601.

It is an arithmetic number, because the mean of its divisors is an integer number (4489296).

Almost surely, 2^51242020 is an apocalyptic number.

It is an amenable number.

51242020 is an abundant number, since it is smaller than the sum of its proper divisors (56501084).

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

51242020 is a wasteful number, since it uses less digits than its factorization.

51242020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219 (or 3217 counting only the distinct ones).

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

The square root of 51242020 is about 7158.3531625647. The cubic root of 51242020 is about 371.4286620174.

Adding to 51242020 its reverse (2024215), we get a palindrome (53266235).

The spelling of 51242020 in words is "fifty-one million, two hundred forty-two thousand, twenty".