20023742 has 4 divisors (see below), whose sum is σ = 30035616. Its totient is φ = 10011870.

The previous prime is 20023741. The next prime is 20023747. The reversal of 20023742 is 24732002.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023741) 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, 5005934 + ... + 5005937.

It is an arithmetic number, because the mean of its divisors is an integer number (7508904).

Almost surely, 2^20023742 is an apocalyptic number.

20023742 is a deficient number, since it is larger than the sum of its proper divisors (10011874).

20023742 is a wasteful number, since it uses less digits than its factorization.

20023742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10011873.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20023742 is about 4474.7896039926. The cubic root of 20023742 is about 271.5491286906.

Adding to 20023742 its reverse (24732002), we get a palindrome (44755744).

The spelling of 20023742 in words is "twenty million, twenty-three thousand, seven hundred forty-two".