20253742 has 4 divisors (see below), whose sum is σ = 30380616. Its totient is φ = 10126870.

The previous prime is 20253733. The next prime is 20253787. The reversal of 20253742 is 24735202.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5063434 + ... + 5063437.

It is an arithmetic number, because the mean of its divisors is an integer number (7595154).

Almost surely, 2^20253742 is an apocalyptic number.

20253742 is a deficient number, since it is larger than the sum of its proper divisors (10126874).

20253742 is a wasteful number, since it uses less digits than its factorization.

20253742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126873.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20253742 is about 4500.4157585716. The cubic root of 20253742 is about 272.5848771877.

Adding to 20253742 its reverse (24735202), we get a palindrome (44988944).

The spelling of 20253742 in words is "twenty million, two hundred fifty-three thousand, seven hundred forty-two".