51820022 has 4 divisors (see below), whose sum is σ = 77730036. Its totient is φ = 25910010.

The previous prime is 51820009. The next prime is 51820037. The reversal of 51820022 is 22002815.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 51819976 and 51820003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12955004 + ... + 12955007.

It is an arithmetic number, because the mean of its divisors is an integer number (19432509).

Almost surely, 2^51820022 is an apocalyptic number.

51820022 is a deficient number, since it is larger than the sum of its proper divisors (25910014).

51820022 is a wasteful number, since it uses less digits than its factorization.

51820022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25910013.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 51820022 is about 7198.6125051985. The cubic root of 51820022 is about 372.8199961875.

Adding to 51820022 its reverse (22002815), we get a palindrome (73822837).

The spelling of 51820022 in words is "fifty-one million, eight hundred twenty thousand, twenty-two".