20259742 has 4 divisors (see below), whose sum is σ = 30389616. Its totient is φ = 10129870.

The previous prime is 20259739. The next prime is 20259749. The reversal of 20259742 is 24795202.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259749) 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 as a sum of consecutive naturals, namely, 5064934 + ... + 5064937.

It is an arithmetic number, because the mean of its divisors is an integer number (7597404).

Almost surely, 2^20259742 is an apocalyptic number.

20259742 is a deficient number, since it is larger than the sum of its proper divisors (10129874).

20259742 is a wasteful number, since it uses less digits than its factorization.

20259742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10129873.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20259742 is about 4501.0823142884. The cubic root of 20259742 is about 272.6117915193.

The spelling of 20259742 in words is "twenty million, two hundred fifty-nine thousand, seven hundred forty-two".