20862109 has 4 divisors (see below), whose sum is σ = 20872480. Its totient is φ = 20851740.

The previous prime is 20862097. The next prime is 20862113. The reversal of 20862109 is 90126802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20862109 - 2⁹ = 20861597 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 (20862119) 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, 1089 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (5218120).

Almost surely, 2^20862109 is an apocalyptic number.

It is an amenable number.

20862109 is a deficient number, since it is larger than the sum of its proper divisors (10371).

20862109 is an equidigital number, since it uses as much as digits as its factorization.

20862109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20862109 is about 4567.5057744901. The cubic root of 20862109 is about 275.2872326684.

The spelling of 20862109 in words is "twenty million, eight hundred sixty-two thousand, one hundred nine".