20017742 has 8 divisors (see below), whose sum is σ = 30045600. Its totient is φ = 10002544.

The previous prime is 20017709. The next prime is 20017759. The reversal of 20017742 is 24771002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4634 + ... + 7842.

It is an arithmetic number, because the mean of its divisors is an integer number (3755700).

Almost surely, 2^20017742 is an apocalyptic number.

20017742 is a deficient number, since it is larger than the sum of its proper divisors (10027858).

20017742 is a wasteful number, since it uses less digits than its factorization.

20017742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6330.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20017742 is about 4474.1191311810. The cubic root of 20017742 is about 271.5220032656.

Adding to 20017742 its reverse (24771002), we get a palindrome (44788744).

The spelling of 20017742 in words is "twenty million, seventeen thousand, seven hundred forty-two".