55111420 has 96 divisors (see below), whose sum is σ = 144281088. Its totient is φ = 17217792.

The previous prime is 55111417. The next prime is 55111429. The reversal of 55111420 is 2411155.

It is a super-2 number, since 2×55111420² = 6074537228832800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194599 + ... + 194881.

It is an arithmetic number, because the mean of its divisors is an integer number (1502928).

Almost surely, 2^55111420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55111420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72140544).

55111420 is an abundant number, since it is smaller than the sum of its proper divisors (89169668).

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

55111420 is a wasteful number, since it uses less digits than its factorization.

55111420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 55111420 is about 7423.7066213584. The cubic root of 55111420 is about 380.5518758670.

Adding to 55111420 its reverse (2411155), we get a palindrome (57522575).

The spelling of 55111420 in words is "fifty-five million, one hundred eleven thousand, four hundred twenty".