30920887 has 4 divisors (see below), whose sum is σ = 30985920. Its totient is φ = 30855856.

The previous prime is 30920881. The next prime is 30920891. The reversal of 30920887 is 78802903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78802903 = 241 ⋅326983.

It is a cyclic number.

It is not a de Polignac number, because 30920887 - 2⁷ = 30920759 is a prime.

It is a super-2 number, since 2×30920887² = 1912202505733538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920881) 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, 31798 + ... + 32755.

It is an arithmetic number, because the mean of its divisors is an integer number (7746480).

Almost surely, 2^30920887 is an apocalyptic number.

30920887 is a deficient number, since it is larger than the sum of its proper divisors (65033).

30920887 is an equidigital number, since it uses as much as digits as its factorization.

30920887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65032.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 30920887 is about 5560.6552671425. The cubic root of 30920887 is about 313.8706074310.

The spelling of 30920887 in words is "thirty million, nine hundred twenty thousand, eight hundred eighty-seven".