30920765 has 8 divisors (see below), whose sum is σ = 38010168. Its totient is φ = 24133120.

The previous prime is 30920759. The next prime is 30920767. The reversal of 30920765 is 56702903.

It can be written as a sum of positive squares in 4 ways, for example, as 4439449 + 26481316 = 2107^2 + 5146^2 .

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

It is not a de Polignac number, because 30920765 - 2⁴ = 30920749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30920767) 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, 75212 + ... + 75621.

It is an arithmetic number, because the mean of its divisors is an integer number (4751271).

Almost surely, 2^30920765 is an apocalyptic number.

It is an amenable number.

30920765 is a deficient number, since it is larger than the sum of its proper divisors (7089403).

30920765 is a wasteful number, since it uses less digits than its factorization.

30920765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150879.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 30920765 is about 5560.6442972015. The cubic root of 30920765 is about 313.8701946327.

The spelling of 30920765 in words is "thirty million, nine hundred twenty thousand, seven hundred sixty-five".