20435421 has 8 divisors (see below), whose sum is σ = 27268384. Its totient is φ = 13613040.

The previous prime is 20435413. The next prime is 20435423. The reversal of 20435421 is 12453402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20435421 - 2³ = 20435413 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 (20435423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5130 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (3408548).

Almost surely, 2^20435421 is an apocalyptic number.

It is an amenable number.

20435421 is a deficient number, since it is larger than the sum of its proper divisors (6832963).

20435421 is a wasteful number, since it uses less digits than its factorization.

20435421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20435421 is about 4520.5553862330. Note that the first 3 decimals coincide. The cubic root of 20435421 is about 273.3974941918.

Adding to 20435421 its reverse (12453402), we get a palindrome (32888823).

The spelling of 20435421 in words is "twenty million, four hundred thirty-five thousand, four hundred twenty-one".