20533906 has 8 divisors (see below), whose sum is σ = 31106124. Its totient is φ = 10165200.

The previous prime is 20533897. The next prime is 20533939. The reversal of 20533906 is 60933502.

It can be written as a sum of positive squares in 2 ways, for example, as 13727025 + 6806881 = 3705^2 + 2609^2 .

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50625 + ... + 51028.

Almost surely, 2^20533906 is an apocalyptic number.

20533906 is a deficient number, since it is larger than the sum of its proper divisors (10572218).

20533906 is a wasteful number, since it uses less digits than its factorization.

20533906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101756.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 20533906 is about 4531.4353134520. The cubic root of 20533906 is about 273.8359879440.

The spelling of 20533906 in words is "twenty million, five hundred thirty-three thousand, nine hundred six".