51020442 has 40 divisors (see below), whose sum is σ = 124720992. Its totient is φ = 15460200.

The previous prime is 51020419. The next prime is 51020443. The reversal of 51020442 is 24402015.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51020443) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12534 + ... + 16097.

Almost surely, 2^51020442 is an apocalyptic number.

51020442 is an abundant number, since it is smaller than the sum of its proper divisors (73700550).

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

51020442 is a wasteful number, since it uses less digits than its factorization.

51020442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28656 (or 28647 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51020442 is about 7142.8595114282. The cubic root of 51020442 is about 370.8925178384.

Adding to 51020442 its reverse (24402015), we get a palindrome (75422457).

The spelling of 51020442 in words is "fifty-one million, twenty thousand, four hundred forty-two".