55420223 has 4 divisors (see below), whose sum is σ = 55504728. Its totient is φ = 55335720.

The previous prime is 55420201. The next prime is 55420229. The reversal of 55420223 is 32202455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32202455 = 5 ⋅6440491.

It is a cyclic number.

It is not a de Polignac number, because 55420223 - 2¹⁴ = 55403839 is a prime.

It is a super-2 number, since 2×55420223² = 6142802234739458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420229) 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, 41261 + ... + 42582.

It is an arithmetic number, because the mean of its divisors is an integer number (13876182).

Almost surely, 2^55420223 is an apocalyptic number.

55420223 is a deficient number, since it is larger than the sum of its proper divisors (84505).

55420223 is an equidigital number, since it uses as much as digits as its factorization.

55420223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84504.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 55420223 is about 7444.4760057374. The cubic root of 55420223 is about 381.2613280518.

Adding to 55420223 its reverse (32202455), we get a palindrome (87622678).

The spelling of 55420223 in words is "fifty-five million, four hundred twenty thousand, two hundred twenty-three".