30520245 has 16 divisors (see below), whose sum is σ = 55808640. Its totient is φ = 13952064.

The previous prime is 30520229. The next prime is 30520247. The reversal of 30520245 is 54202503.

It is not a de Polignac number, because 30520245 - 2⁴ = 30520229 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30520247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145230 + ... + 145439.

It is an arithmetic number, because the mean of its divisors is an integer number (3488040).

Almost surely, 2^30520245 is an apocalyptic number.

30520245 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30520245 is a deficient number, since it is larger than the sum of its proper divisors (25288395).

30520245 is a wasteful number, since it uses less digits than its factorization.

30520245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290684.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 30520245 is about 5524.5131007176. The cubic root of 30520245 is about 312.5091026682.

Adding to 30520245 its reverse (54202503), we get a palindrome (84722748).

The spelling of 30520245 in words is "thirty million, five hundred twenty thousand, two hundred forty-five".