55020040 has 32 divisors (see below), whose sum is σ = 127791360. Its totient is φ = 21297600.

The previous prime is 55020023. The next prime is 55020061. The reversal of 55020040 is 4002055.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55019996 and 55020023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20946 + ... + 23425.

It is an arithmetic number, because the mean of its divisors is an integer number (3993480).

Almost surely, 2^55020040 is an apocalyptic number.

It is an amenable number.

55020040 is an abundant number, since it is smaller than the sum of its proper divisors (72771320).

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

55020040 is a wasteful number, since it uses less digits than its factorization.

55020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44413 (or 44409 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 55020040 is about 7417.5494605698. The cubic root of 55020040 is about 380.3414290537.

Adding to 55020040 its reverse (4002055), we get a palindrome (59022095).

The spelling of 55020040 in words is "fifty-five million, twenty thousand, forty".