55020620 has 24 divisors (see below), whose sum is σ = 116049024. Its totient is φ = 21911936.

The previous prime is 55020587. The next prime is 55020661. The reversal of 55020620 is 2602055.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 55020592 and 55020601.

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, 1244 + ... + 10563.

It is an arithmetic number, because the mean of its divisors is an integer number (4835376).

Almost surely, 2^55020620 is an apocalyptic number.

It is an amenable number.

55020620 is an abundant number, since it is smaller than the sum of its proper divisors (61028404).

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

55020620 is a wasteful number, since it uses less digits than its factorization.

55020620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12049 (or 12047 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 55020620 is about 7417.5885569368. The cubic root of 55020620 is about 380.3427655198.

Adding to 55020620 its reverse (2602055), we get a palindrome (57622675).

The spelling of 55020620 in words is "fifty-five million, twenty thousand, six hundred twenty".