20409235 has 24 divisors (see below), whose sum is σ = 31083696. Its totient is φ = 12720960.

The previous prime is 20409229. The next prime is 20409247. The reversal of 20409235 is 53290402.

It is a happy number.

It is not a de Polignac number, because 20409235 - 2⁵ = 20409203 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1092 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (1295154).

Almost surely, 2^20409235 is an apocalyptic number.

20409235 is a deficient number, since it is larger than the sum of its proper divisors (10674461).

20409235 is a wasteful number, since it uses less digits than its factorization.

20409235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7603 (or 7596 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20409235 is about 4517.6581322628. The cubic root of 20409235 is about 273.2806668638.

Adding to 20409235 its reverse (53290402), we get a palindrome (73699637).

The spelling of 20409235 in words is "twenty million, four hundred nine thousand, two hundred thirty-five".