55381020 has 24 divisors (see below), whose sum is σ = 155067024. Its totient is φ = 14768256.

The previous prime is 55381013. The next prime is 55381021. The reversal of 55381020 is 2018355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55381021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461449 + ... + 461568.

It is an arithmetic number, because the mean of its divisors is an integer number (6461126).

Almost surely, 2^55381020 is an apocalyptic number.

It is an amenable number.

55381020 is an abundant number, since it is smaller than the sum of its proper divisors (99686004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55381020 is a wasteful number, since it uses less digits than its factorization.

55381020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923029 (or 923027 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 55381020 is about 7441.8425137865. The cubic root of 55381020 is about 381.1714083275.

Adding to 55381020 its reverse (2018355), we get a palindrome (57399375).

The spelling of 55381020 in words is "fifty-five million, three hundred eighty-one thousand, twenty".