30553020 has 72 divisors (see below), whose sum is σ = 93169440. Its totient is φ = 8104320.

The previous prime is 30553001. The next prime is 30553021. The reversal of 30553020 is 2035503.

It is a super-2 number, since 2×30553020² = 1866974062240800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30552984 and 30553002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30553021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48105 + ... + 48735.

It is an arithmetic number, because the mean of its divisors is an integer number (1294020).

Almost surely, 2^30553020 is an apocalyptic number.

30553020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30553020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46584720).

30553020 is an abundant number, since it is smaller than the sum of its proper divisors (62616420).

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

30553020 is a wasteful number, since it uses less digits than its factorization.

30553020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 18.

The square root of 30553020 is about 5527.4786295381. The cubic root of 30553020 is about 312.6209281317.

Adding to 30553020 its reverse (2035503), we get a palindrome (32588523).

The spelling of 30553020 in words is "thirty million, five hundred fifty-three thousand, twenty".