55203930 has 160 divisors (see below), whose sum is σ = 166224960. Its totient is φ = 13063680.

The previous prime is 55203923. The next prime is 55203937. The reversal of 55203930 is 3930255.

It is an interprime number because it is at equal distance from previous prime (55203923) and next prime (55203937).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55203894 and 55203903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55203937) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 261525 + ... + 261735.

It is an arithmetic number, because the mean of its divisors is an integer number (1038906).

Almost surely, 2^55203930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55203930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83112480).

55203930 is an abundant number, since it is smaller than the sum of its proper divisors (111021030).

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

55203930 is a wasteful number, since it uses less digits than its factorization.

55203930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

The square root of 55203930 is about 7429.9347238048. The cubic root of 55203930 is about 380.7646882272.

The spelling of 55203930 in words is "fifty-five million, two hundred three thousand, nine hundred thirty".