55418820 has 96 divisors (see below), whose sum is σ = 164868480. Its totient is φ = 13870080.

The previous prime is 55418819. The next prime is 55418833. The reversal of 55418820 is 2881455.

It is a super-2 number, since 2×55418820² = 6142491220384800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197080 + ... + 197360.

It is an arithmetic number, because the mean of its divisors is an integer number (1717380).

Almost surely, 2^55418820 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 55418820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82434240).

55418820 is an abundant number, since it is smaller than the sum of its proper divisors (109449660).

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

55418820 is a wasteful number, since it uses less digits than its factorization.

55418820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 55418820 is about 7444.3817741972. The cubic root of 55418820 is about 381.2581107295.

The spelling of 55418820 in words is "fifty-five million, four hundred eighteen thousand, eight hundred twenty".