51820023 has 16 divisors (see below), whose sum is σ = 70997472. Its totient is φ = 33600000.

The previous prime is 51820009. The next prime is 51820037. The reversal of 51820023 is 32002815.

It is an interprime number because it is at equal distance from previous prime (51820009) and next prime (51820037).

It is not a de Polignac number, because 51820023 - 2⁴ = 51820007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51820723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73573 + ... + 74273.

It is an arithmetic number, because the mean of its divisors is an integer number (4437342).

Almost surely, 2^51820023 is an apocalyptic number.

51820023 is a deficient number, since it is larger than the sum of its proper divisors (19177449).

51820023 is a wasteful number, since it uses less digits than its factorization.

51820023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51820023 is about 7198.6125746563. The cubic root of 51820023 is about 372.8199985856.

Adding to 51820023 its reverse (32002815), we get a palindrome (83822838).

The spelling of 51820023 in words is "fifty-one million, eight hundred twenty thousand, twenty-three".