20633421 has 16 divisors (see below), whose sum is σ = 28638720. Its totient is φ = 13203120.

The previous prime is 20633419. The next prime is 20633429. The reversal of 20633421 is 12433602.

It is a happy number.

It is not a de Polignac number, because 20633421 - 2¹ = 20633419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20633429) 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, 6256 + ... + 8966.

It is an arithmetic number, because the mean of its divisors is an integer number (1789920).

Almost surely, 2^20633421 is an apocalyptic number.

It is an amenable number.

20633421 is a deficient number, since it is larger than the sum of its proper divisors (8005299).

20633421 is a wasteful number, since it uses less digits than its factorization.

20633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20633421 is about 4542.4025581183. The cubic root of 20633421 is about 274.2776458208.

The spelling of 20633421 in words is "twenty million, six hundred thirty-three thousand, four hundred twenty-one".