20633906 has 16 divisors (see below), whose sum is σ = 32802840. Its totient is φ = 9717120.

The previous prime is 20633881. The next prime is 20633911. The reversal of 20633906 is 60933602.

It can be written as a sum of positive squares in 4 ways, for example, as 10297681 + 10336225 = 3209^2 + 3215^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon 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 in 7 ways as a sum of consecutive naturals, for example, 1961 + ... + 6716.

Almost surely, 2^20633906 is an apocalyptic number.

20633906 is a deficient number, since it is larger than the sum of its proper divisors (12168934).

20633906 is a wasteful number, since it uses less digits than its factorization.

20633906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8749.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20633906 is about 4542.4559436499. The cubic root of 20633906 is about 274.2797948200.

The spelling of 20633906 in words is "twenty million, six hundred thirty-three thousand, nine hundred six".