20740305 has 32 divisors (see below), whose sum is σ = 35533440. Its totient is φ = 10298880.

The previous prime is 20740297. The next prime is 20740351. The reversal of 20740305 is 50304702.

It is a happy number.

It is not a de Polignac number, because 20740305 - 2³ = 20740297 is a prime.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 16789 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (1110420).

Almost surely, 2^20740305 is an apocalyptic number.

It is an amenable number.

20740305 is a deficient number, since it is larger than the sum of its proper divisors (14793135).

20740305 is a wasteful number, since it uses less digits than its factorization.

20740305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20740305 is about 4554.1525007404. The cubic root of 20740305 is about 274.7504292229.

The spelling of 20740305 in words is "twenty million, seven hundred forty thousand, three hundred five".