20842311 has 16 divisors (see below), whose sum is σ = 31883264. Its totient is φ = 11863584.

The previous prime is 20842279. The next prime is 20842319. The reversal of 20842311 is 11324802.

It is not a de Polignac number, because 20842311 - 2⁵ = 20842279 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842319) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4026 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (1992704).

Almost surely, 2^20842311 is an apocalyptic number.

20842311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20842311 is a deficient number, since it is larger than the sum of its proper divisors (11040953).

20842311 is a wasteful number, since it uses less digits than its factorization.

20842311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20842311 is about 4565.3379940591. The cubic root of 20842311 is about 275.2001232014.

The spelling of 20842311 in words is "twenty million, eight hundred forty-two thousand, three hundred eleven".