55550420 has 12 divisors (see below), whose sum is σ = 116655924. Its totient is φ = 22220160.

The previous prime is 55550371. The next prime is 55550423. The reversal of 55550420 is 2405555.

It can be written as a sum of positive squares in 2 ways, for example, as 16662724 + 38887696 = 4082^2 + 6236^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55550420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55550423) 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, 1388741 + ... + 1388780.

It is an arithmetic number, because the mean of its divisors is an integer number (9721327).

Almost surely, 2^55550420 is an apocalyptic number.

It is an amenable number.

55550420 is an abundant number, since it is smaller than the sum of its proper divisors (61105504).

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

55550420 is a wasteful number, since it uses less digits than its factorization.

55550420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777530 (or 2777528 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 55550420 is about 7453.2154134977. The cubic root of 55550420 is about 381.5596563350.

Adding to 55550420 its reverse (2405555), we get a palindrome (57955975).

The spelling of 55550420 in words is "fifty-five million, five hundred fifty thousand, four hundred twenty".