30920613 has 4 divisors (see below), whose sum is σ = 41227488. Its totient is φ = 20613740.

The previous prime is 30920599. The next prime is 30920623. The reversal of 30920613 is 31602903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31602903 = 3 ⋅10534301.

It is a cyclic number.

It is not a de Polignac number, because 30920613 - 2⁴ = 30920597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5153433 + ... + 5153438.

It is an arithmetic number, because the mean of its divisors is an integer number (10306872).

Almost surely, 2^30920613 is an apocalyptic number.

It is an amenable number.

30920613 is a deficient number, since it is larger than the sum of its proper divisors (10306875).

30920613 is a wasteful number, since it uses less digits than its factorization.

30920613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306874.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 30920613 is about 5560.6306297038. The cubic root of 30920613 is about 313.8696803252.

The spelling of 30920613 in words is "thirty million, nine hundred twenty thousand, six hundred thirteen".