20913093 has 16 divisors (see below), whose sum is σ = 31704640. Its totient is φ = 13617072.

The previous prime is 20913083. The next prime is 20913133. The reversal of 20913093 is 39031902.

It is not a de Polignac number, because 20913093 - 2¹⁰ = 20912069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20913083) 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, 7846 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (1981540).

Almost surely, 2^20913093 is an apocalyptic number.

It is an amenable number.

20913093 is a deficient number, since it is larger than the sum of its proper divisors (10791547).

20913093 is a wasteful number, since it uses less digits than its factorization.

20913093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18065 (or 18059 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20913093 is about 4573.0835330223. The cubic root of 20913093 is about 275.5113043957.

Adding to 20913093 its reverse (39031902), we get a palindrome (59944995).

It can be divided in two parts, 2091 and 3093, that added together give a square (5184 = 72²).

The spelling of 20913093 in words is "twenty million, nine hundred thirteen thousand, ninety-three".