20303811 has 32 divisors (see below), whose sum is σ = 33120000. Its totient is φ = 12191040.

The previous prime is 20303809. The next prime is 20303887. The reversal of 20303811 is 11830302.

It is not a de Polignac number, because 20303811 - 2¹ = 20303809 is a prime.

It is a super-2 number, since 2×20303811² = 824489482247442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20303011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40440 + ... + 40938.

It is an arithmetic number, because the mean of its divisors is an integer number (1035000).

Almost surely, 2^20303811 is an apocalyptic number.

20303811 is a deficient number, since it is larger than the sum of its proper divisors (12816189).

20303811 is a wasteful number, since it uses less digits than its factorization.

20303811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20303811 is about 4505.9750332198. The cubic root of 20303811 is about 272.8093101385.

The spelling of 20303811 in words is "twenty million, three hundred three thousand, eight hundred eleven".