55813020 has 96 divisors (see below), whose sum is σ = 165881856. Its totient is φ = 13996800.

The previous prime is 55813003. The next prime is 55813027. The reversal of 55813020 is 2031855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55813027) 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, 68415 + ... + 69225.

It is an arithmetic number, because the mean of its divisors is an integer number (1727936).

Almost surely, 2^55813020 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 55813020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82940928).

55813020 is an abundant number, since it is smaller than the sum of its proper divisors (110068836).

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

55813020 is a wasteful number, since it uses less digits than its factorization.

55813020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 889 counting only the distinct ones).

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

The square root of 55813020 is about 7470.8112009339. The cubic root of 55813020 is about 382.1599523856.

Adding to 55813020 its reverse (2031855), we get a palindrome (57844875).

The spelling of 55813020 in words is "fifty-five million, eight hundred thirteen thousand, twenty".