20402793 has 16 divisors (see below), whose sum is σ = 30320640. Its totient is φ = 13559472.

The previous prime is 20402761. The next prime is 20402797. The reversal of 20402793 is 39720402.

It is not a de Polignac number, because 20402793 - 2⁵ = 20402761 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20402797) 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, 9355 + ... + 11327.

It is an arithmetic number, because the mean of its divisors is an integer number (1895040).

Almost surely, 2^20402793 is an apocalyptic number.

It is an amenable number.

20402793 is a deficient number, since it is larger than the sum of its proper divisors (9917847).

20402793 is a wasteful number, since it uses less digits than its factorization.

20402793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20402793 is about 4516.9450959692. The cubic root of 20402793 is about 273.2519109384.

The spelling of 20402793 in words is "twenty million, four hundred two thousand, seven hundred ninety-three".