20420435 has 16 divisors (see below), whose sum is σ = 29223936. Its totient is φ = 13393248.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420435 is 53402402.

It is a cyclic number.

It is not a de Polignac number, because 20420435 - 2⁶ = 20420371 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11879 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (1826496).

Almost surely, 2^20420435 is an apocalyptic number.

20420435 is a deficient number, since it is larger than the sum of its proper divisors (8803501).

20420435 is a wasteful number, since it uses less digits than its factorization.

20420435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25402.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20420435 is about 4518.8975425429. The cubic root of 20420435 is about 273.3306472404.

Adding to 20420435 its reverse (53402402), we get a palindrome (73822837).

The spelling of 20420435 in words is "twenty million, four hundred twenty thousand, four hundred thirty-five".