20420109 has 12 divisors (see below), whose sum is σ = 29611296. Its totient is φ = 13560072.

The previous prime is 20420107. The next prime is 20420119. The reversal of 20420109 is 90102402.

It is not a de Polignac number, because 20420109 - 2¹ = 20420107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20420091 and 20420100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420107) 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 11 ways as a sum of consecutive naturals, for example, 1947 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (2467608).

Almost surely, 2^20420109 is an apocalyptic number.

It is an amenable number.

20420109 is a deficient number, since it is larger than the sum of its proper divisors (9191187).

20420109 is a wasteful number, since it uses less digits than its factorization.

20420109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8896 (or 8893 counting only the distinct ones).

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

The square root of 20420109 is about 4518.8614716541. The cubic root of 20420109 is about 273.3291927127.

The spelling of 20420109 in words is "twenty million, four hundred twenty thousand, one hundred nine".