55251020 has 108 divisors (see below), whose sum is σ = 137192160. Its totient is φ = 18670080.

The previous prime is 55251017. The next prime is 55251041. The reversal of 55251020 is 2015255.

It is a super-2 number, since 2×55251020² = 6105350422080800, which contains 22 as substring.

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 = 55250983 and 55251001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 699341 + ... + 699419.

Almost surely, 2^55251020 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 55251020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68596080).

55251020 is an abundant number, since it is smaller than the sum of its proper divisors (81941140).

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

55251020 is a wasteful number, since it uses less digits than its factorization.

55251020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 55251020 is about 7433.1029859676. The cubic root of 55251020 is about 380.8729239592.

Adding to 55251020 its reverse (2015255), we get a palindrome (57266275).

The spelling of 55251020 in words is "fifty-five million, two hundred fifty-one thousand, twenty".