20347930 has 8 divisors (see below), whose sum is σ = 36626292. Its totient is φ = 8139168.

The previous prime is 20347909. The next prime is 20347973. The reversal of 20347930 is 3974302.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 106929 = 4499^2 + 327^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017387 + ... + 1017406.

Almost surely, 2^20347930 is an apocalyptic number.

20347930 is a deficient number, since it is larger than the sum of its proper divisors (16278362).

20347930 is a wasteful number, since it uses less digits than its factorization.

20347930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034800.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20347930 is about 4510.8679874277. The cubic root of 20347930 is about 273.0067667731.

The spelling of 20347930 in words is "twenty million, three hundred forty-seven thousand, nine hundred thirty".