20247742 has 8 divisors (see below), whose sum is σ = 31419000. Its totient is φ = 9774744.

The previous prime is 20247739. The next prime is 20247763. The reversal of 20247742 is 24774202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20247742.

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, 174492 + ... + 174607.

It is an arithmetic number, because the mean of its divisors is an integer number (3927375).

Almost surely, 2^20247742 is an apocalyptic number.

20247742 is a deficient number, since it is larger than the sum of its proper divisors (11171258).

20247742 is a wasteful number, since it uses less digits than its factorization.

20247742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349130.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 20247742 is about 4499.7491041168. The cubic root of 20247742 is about 272.5579575401.

The spelling of 20247742 in words is "twenty million, two hundred forty-seven thousand, seven hundred forty-two".