30621220 has 24 divisors (see below), whose sum is σ = 73491264. Its totient is φ = 10498656.

The previous prime is 30621209. The next prime is 30621221. The reversal of 30621220 is 2212603.

It is a super-2 number, since 2×30621220² = 1875318228576800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30621194 and 30621203.

It is not an unprimeable number, because it can be changed into a prime (30621221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109222 + ... + 109501.

It is an arithmetic number, because the mean of its divisors is an integer number (3062136).

Almost surely, 2^30621220 is an apocalyptic number.

It is an amenable number.

30621220 is an abundant number, since it is smaller than the sum of its proper divisors (42870044).

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

30621220 is a wasteful number, since it uses less digits than its factorization.

30621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218739 (or 218737 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30621220 is about 5533.6443687682. The cubic root of 30621220 is about 312.8533645433.

Adding to 30621220 its reverse (2212603), we get a palindrome (32833823).

The spelling of 30621220 in words is "thirty million, six hundred twenty-one thousand, two hundred twenty".