20913233 has 16 divisors (see below), whose sum is σ = 24026112. Its totient is φ = 18018000.

The previous prime is 20913229. The next prime is 20913271. The reversal of 20913233 is 33231902.

It is not a de Polignac number, because 20913233 - 2² = 20913229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 20913199 and 20913208.

It is not an unprimeable number, because it can be changed into a prime (20913203) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 32828 + ... + 33458.

It is an arithmetic number, because the mean of its divisors is an integer number (1501632).

Almost surely, 2^20913233 is an apocalyptic number.

20913233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20913233 is a deficient number, since it is larger than the sum of its proper divisors (3112879).

20913233 is a wasteful number, since it uses less digits than its factorization.

20913233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20913233 is about 4573.0988399552. The cubic root of 20913233 is about 275.5119191859.

The spelling of 20913233 in words is "twenty million, nine hundred thirteen thousand, two hundred thirty-three".