20749306 has 8 divisors (see below), whose sum is σ = 31847904. Its totient is φ = 10133340.

The previous prime is 20749303. The next prime is 20749327. The reversal of 20749306 is 60394702.

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

It is not an unprimeable number, because it can be changed into a prime (20749303) 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, 120550 + ... + 120721.

It is an arithmetic number, because the mean of its divisors is an integer number (3980988).

Almost surely, 2^20749306 is an apocalyptic number.

20749306 is a deficient number, since it is larger than the sum of its proper divisors (11098598).

20749306 is a wasteful number, since it uses less digits than its factorization.

20749306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241316.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20749306 is about 4555.1406125388. The cubic root of 20749306 is about 274.7901694123.

The spelling of 20749306 in words is "twenty million, seven hundred forty-nine thousand, three hundred six".