55530020 has 72 divisors (see below), whose sum is σ = 144373824. Its totient is φ = 17566848.

The previous prime is 55530019. The next prime is 55530029. The reversal of 55530020 is 2003555.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 55529974 and 55530001.

It is not an unprimeable number, because it can be changed into a prime (55530029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22487 + ... + 24833.

It is an arithmetic number, because the mean of its divisors is an integer number (2005192).

Almost surely, 2^55530020 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 55530020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72186912).

55530020 is an abundant number, since it is smaller than the sum of its proper divisors (88843804).

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

55530020 is a wasteful number, since it uses less digits than its factorization.

55530020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 55530020 is about 7451.8467509739. The cubic root of 55530020 is about 381.5129433968.

Adding to 55530020 its reverse (2003555), we get a palindrome (57533575).

The spelling of 55530020 in words is "fifty-five million, five hundred thirty thousand, twenty".