20212406 has 4 divisors (see below), whose sum is σ = 30318612. Its totient is φ = 10106202.

The previous prime is 20212399. The next prime is 20212417. The reversal of 20212406 is 60421202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60421202 = 2 ⋅30210601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5053100 + ... + 5053103.

It is an arithmetic number, because the mean of its divisors is an integer number (7579653).

Almost surely, 2^20212406 is an apocalyptic number.

20212406 is a deficient number, since it is larger than the sum of its proper divisors (10106206).

20212406 is a wasteful number, since it uses less digits than its factorization.

20212406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10106205.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20212406 is about 4495.8209483920. The cubic root of 20212406 is about 272.3993107783.

Adding to 20212406 its reverse (60421202), we get a palindrome (80633608).

The spelling of 20212406 in words is "twenty million, two hundred twelve thousand, four hundred six".