20501133 has 16 divisors (see below), whose sum is σ = 30467520. Its totient is φ = 12185856.

The previous prime is 20501123. The next prime is 20501141. The reversal of 20501133 is 33110502.

It is a happy number.

It is not a de Polignac number, because 20501133 - 2⁶ = 20501069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501123) 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, 9610 + ... + 11547.

It is an arithmetic number, because the mean of its divisors is an integer number (1904220).

Almost surely, 2^20501133 is an apocalyptic number.

It is an amenable number.

20501133 is a deficient number, since it is larger than the sum of its proper divisors (9966387).

20501133 is a wasteful number, since it uses less digits than its factorization.

20501133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21196.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 20501133 is about 4527.8176862590. The cubic root of 20501133 is about 273.6902256846.

Adding to 20501133 its reverse (33110502), we get a palindrome (53611635).

The spelling of 20501133 in words is "twenty million, five hundred one thousand, one hundred thirty-three".