55438020 has 288 divisors, whose sum is σ = 204736896. Its totient is φ = 12441600.

The previous prime is 55437997. The next prime is 55438039. The reversal of 55438020 is 2083455.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 908790 + ... + 908850.

It is an arithmetic number, because the mean of its divisors is an integer number (710892).

Almost surely, 2^55438020 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 55438020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102368448).

55438020 is an abundant number, since it is smaller than the sum of its proper divisors (149298876).

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

55438020 is a wasteful number, since it uses less digits than its factorization.

55438020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 55438020 is about 7445.6712256183. The cubic root of 55438020 is about 381.3021349469.

The spelling of 55438020 in words is "fifty-five million, four hundred thirty-eight thousand, twenty".