20023905 has 16 divisors (see below), whose sum is σ = 34951104. Its totient is φ = 9708480.

The previous prime is 20023903. The next prime is 20023907. The reversal of 20023905 is 50932002.

It is an interprime number because it is at equal distance from previous prime (20023903) and next prime (20023907).

It is not a de Polignac number, because 20023905 - 2¹ = 20023903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20023901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60514 + ... + 60843.

It is an arithmetic number, because the mean of its divisors is an integer number (2184444).

Almost surely, 2^20023905 is an apocalyptic number.

It is an amenable number.

20023905 is a deficient number, since it is larger than the sum of its proper divisors (14927199).

20023905 is a wasteful number, since it uses less digits than its factorization.

20023905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121376.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20023905 is about 4474.8078171023. The cubic root of 20023905 is about 271.5498655224.

Adding to 20023905 its reverse (50932002), we get a palindrome (70955907).

The spelling of 20023905 in words is "twenty million, twenty-three thousand, nine hundred five".