20010309 has 32 divisors (see below), whose sum is σ = 31446144. Its totient is φ = 11182080.

The previous prime is 20010307. The next prime is 20010313. The reversal of 20010309 is 90301002.

It is not a de Polignac number, because 20010309 - 2¹ = 20010307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29397 + ... + 30069.

It is an arithmetic number, because the mean of its divisors is an integer number (982692).

Almost surely, 2^20010309 is an apocalyptic number.

It is an amenable number.

20010309 is a deficient number, since it is larger than the sum of its proper divisors (11435835).

20010309 is a wasteful number, since it uses less digits than its factorization.

20010309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 20010309 is about 4473.2883877523. The cubic root of 20010309 is about 271.4883918672.

The spelling of 20010309 in words is "twenty million, ten thousand, three hundred nine".