20742795 has 12 divisors (see below), whose sum is σ = 35954256. Its totient is φ = 11062800.

The previous prime is 20742763. The next prime is 20742797. The reversal of 20742795 is 59724702.

It is not a de Polignac number, because 20742795 - 2⁵ = 20742763 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20742797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230431 + ... + 230520.

It is an arithmetic number, because the mean of its divisors is an integer number (2996188).

Almost surely, 2^20742795 is an apocalyptic number.

20742795 is a deficient number, since it is larger than the sum of its proper divisors (15211461).

20742795 is a wasteful number, since it uses less digits than its factorization.

20742795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460962 (or 460959 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20742795 is about 4554.4258694154. The cubic root of 20742795 is about 274.7614239373.

The spelling of 20742795 in words is "twenty million, seven hundred forty-two thousand, seven hundred ninety-five".