20221906 has 8 divisors (see below), whose sum is σ = 31152780. Its totient is φ = 9837648.

The previous prime is 20221879. The next prime is 20221913. The reversal of 20221906 is 60912202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19000881 + 1221025 = 4359^2 + 1105^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 136561 + ... + 136708.

Almost surely, 2^20221906 is an apocalyptic number.

20221906 is a deficient number, since it is larger than the sum of its proper divisors (10930874).

20221906 is a wasteful number, since it uses less digits than its factorization.

20221906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273308.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20221906 is about 4496.8773610140. The cubic root of 20221906 is about 272.4419807459.

The spelling of 20221906 in words is "twenty million, two hundred twenty-one thousand, nine hundred six".