551305020 has 96 divisors (see below), whose sum is σ = 1772822016. Its totient is φ = 125395200.

The previous prime is 551304977. The next prime is 551305033. The reversal of 551305020 is 20503155.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 85510 + ... + 91730.

It is an arithmetic number, because the mean of its divisors is an integer number (18466896).

Almost surely, 2^551305020 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 551305020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886411008).

551305020 is an abundant number, since it is smaller than the sum of its proper divisors (1221516996).

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

551305020 is a wasteful number, since it uses less digits than its factorization.

551305020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6451 (or 6449 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 551305020 is about 23479.8854341328. The cubic root of 551305020 is about 819.9687773160.

Adding to 551305020 its reverse (20503155), we get a palindrome (571808175).

The spelling of 551305020 in words is "five hundred fifty-one million, three hundred five thousand, twenty".