55420023 has 4 divisors (see below), whose sum is σ = 73893368. Its totient is φ = 36946680.

The previous prime is 55419929. The next prime is 55420039. The reversal of 55420023 is 32002455.

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

It is not a de Polignac number, because 55420023 - 2¹³ = 55411831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420063) 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, 9236668 + ... + 9236673.

It is an arithmetic number, because the mean of its divisors is an integer number (18473342).

Almost surely, 2^55420023 is an apocalyptic number.

55420023 is a deficient number, since it is larger than the sum of its proper divisors (18473345).

55420023 is a wasteful number, since it uses less digits than its factorization.

55420023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18473344.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55420023 is about 7444.4625729464. The cubic root of 55420023 is about 381.2608694205.

Adding to 55420023 its reverse (32002455), we get a palindrome (87422478).

The spelling of 55420023 in words is "fifty-five million, four hundred twenty thousand, twenty-three".