20862811 has 4 divisors (see below), whose sum is σ = 20886624. Its totient is φ = 20839000.

The previous prime is 20862781. The next prime is 20862841. The reversal of 20862811 is 11826802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20862781) and next prime (20862841).

It is a cyclic number.

It is not a de Polignac number, because 20862811 - 2⁷ = 20862683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20862811.

It is not an unprimeable number, because it can be changed into a prime (20862841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10540 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (5221656).

Almost surely, 2^20862811 is an apocalyptic number.

20862811 is a deficient number, since it is larger than the sum of its proper divisors (23813).

20862811 is an equidigital number, since it uses as much as digits as its factorization.

20862811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23812.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 20862811 is about 4567.5826210371. The cubic root of 20862811 is about 275.2903203951.

The spelling of 20862811 in words is "twenty million, eight hundred sixty-two thousand, eight hundred eleven".