30920281 has 8 divisors (see below), whose sum is σ = 35536320. Its totient is φ = 26353968.

The previous prime is 30920249. The next prime is 30920321. The reversal of 30920281 is 18202903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30920281 - 2⁵ = 30920249 is a prime.

It is a super-2 number, since 2×30920281² = 1912127554237922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30920231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11086 + ... + 13591.

It is an arithmetic number, because the mean of its divisors is an integer number (4442040).

Almost surely, 2^30920281 is an apocalyptic number.

It is an amenable number.

30920281 is a deficient number, since it is larger than the sum of its proper divisors (4616039).

30920281 is a wasteful number, since it uses less digits than its factorization.

30920281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24863.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 30920281 is about 5560.6007768945. The cubic root of 30920281 is about 313.8685569634.

The spelling of 30920281 in words is "thirty million, nine hundred twenty thousand, two hundred eighty-one".