20931033 has 16 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 13547520.

The previous prime is 20930999. The next prime is 20931047. The reversal of 20931033 is 33013902.

It is not a de Polignac number, because 20931033 - 2⁶ = 20930969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20931133) 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, 46393 + ... + 46841.

It is an arithmetic number, because the mean of its divisors is an integer number (1795500).

Almost surely, 2^20931033 is an apocalyptic number.

It is an amenable number.

20931033 is a deficient number, since it is larger than the sum of its proper divisors (7796967).

20931033 is a wasteful number, since it uses less digits than its factorization.

20931033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 20931033 is about 4575.0445899466. The cubic root of 20931033 is about 275.5900630333.

Adding to 20931033 its reverse (33013902), we get a palindrome (53944935).

The spelling of 20931033 in words is "twenty million, nine hundred thirty-one thousand, thirty-three".