55817020 has 24 divisors (see below), whose sum is σ = 133961184. Its totient is φ = 19137216.

The previous prime is 55817017. The next prime is 55817029. The reversal of 55817020 is 2071855.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 55817020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55817029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199207 + ... + 199486.

It is an arithmetic number, because the mean of its divisors is an integer number (5581716).

Almost surely, 2^55817020 is an apocalyptic number.

It is an amenable number.

55817020 is an abundant number, since it is smaller than the sum of its proper divisors (78144164).

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

55817020 is a wasteful number, since it uses less digits than its factorization.

55817020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398709 (or 398707 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55817020 is about 7471.0789046830. The cubic root of 55817020 is about 382.1690816969.

Adding to 55817020 its reverse (2071855), we get a palindrome (57888875).

It can be divided in two parts, 558 and 17020, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 55817020 in words is "fifty-five million, eight hundred seventeen thousand, twenty".