51542020 has 12 divisors (see below), whose sum is σ = 108238284. Its totient is φ = 20616800.

The previous prime is 51541991. The next prime is 51542027. The reversal of 51542020 is 2024515.

It can be written as a sum of positive squares in 2 ways, for example, as 12404484 + 39137536 = 3522^2 + 6256^2 .

It is not an unprimeable number, because it can be changed into a prime (51542027) 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, 1288531 + ... + 1288570.

It is an arithmetic number, because the mean of its divisors is an integer number (9019857).

Almost surely, 2^51542020 is an apocalyptic number.

It is an amenable number.

51542020 is an abundant number, since it is smaller than the sum of its proper divisors (56696264).

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

51542020 is a wasteful number, since it uses less digits than its factorization.

51542020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577110 (or 2577108 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 51542020 is about 7179.2771223850. The cubic root of 51542020 is about 372.1521037529.

Adding to 51542020 its reverse (2024515), we get a palindrome (53566535).

The spelling of 51542020 in words is "fifty-one million, five hundred forty-two thousand, twenty".