20803311 has 10 divisors (see below), whose sum is σ = 31076672. Its totient is φ = 13868820.

The previous prime is 20803303. The next prime is 20803373. The reversal of 20803311 is 11330802.

It is not a de Polignac number, because 20803311 - 2³ = 20803303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20803301) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 128335 + ... + 128496.

Almost surely, 2^20803311 is an apocalyptic number.

20803311 is a deficient number, since it is larger than the sum of its proper divisors (10273361).

20803311 is an equidigital number, since it uses as much as digits as its factorization.

20803311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256843 (or 256834 counting only the distinct ones).

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

The square root of 20803311 is about 4561.0646783399. The cubic root of 20803311 is about 275.0283651182.

The spelling of 20803311 in words is "twenty million, eight hundred three thousand, three hundred eleven".