55020213 has 6 divisors (see below), whose sum is σ = 79473654. Its totient is φ = 36680136.

The previous prime is 55020197. The next prime is 55020223. The reversal of 55020213 is 31202055.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50722884 + 4297329 = 7122^2 + 2073^2 .

It is not a de Polignac number, because 55020213 - 2⁴ = 55020197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55020223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3056670 + ... + 3056687.

It is an arithmetic number, because the mean of its divisors is an integer number (13245609).

Almost surely, 2^55020213 is an apocalyptic number.

It is an amenable number.

55020213 is a deficient number, since it is larger than the sum of its proper divisors (24453441).

55020213 is a wasteful number, since it uses less digits than its factorization.

55020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113363 (or 6113360 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 55020213 is about 7417.5611220940. The cubic root of 55020213 is about 380.3418276903.

Adding to 55020213 its reverse (31202055), we get a palindrome (86222268).

The spelling of 55020213 in words is "fifty-five million, twenty thousand, two hundred thirteen".