30621020 has 12 divisors (see below), whose sum is σ = 64304184. Its totient is φ = 12248400.

The previous prime is 30621011. The next prime is 30621023. The reversal of 30621020 is 2012603.

It is a junction number, because it is equal to n+sod(n) for n = 30620986 and 30621004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30621023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765506 + ... + 765545.

It is an arithmetic number, because the mean of its divisors is an integer number (5358682).

Almost surely, 2^30621020 is an apocalyptic number.

It is an amenable number.

30621020 is an abundant number, since it is smaller than the sum of its proper divisors (33683164).

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

30621020 is a wasteful number, since it uses less digits than its factorization.

30621020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531060 (or 1531058 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 30621020 is about 5533.6262974653. The cubic root of 30621020 is about 312.8526834164.

Adding to 30621020 its reverse (2012603), we get a palindrome (32633623).

The spelling of 30621020 in words is "thirty million, six hundred twenty-one thousand, twenty".