20824742 has 4 divisors (see below), whose sum is σ = 31237116. Its totient is φ = 10412370.

The previous prime is 20824721. The next prime is 20824757. The reversal of 20824742 is 24742802.

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5206184 + ... + 5206187.

It is an arithmetic number, because the mean of its divisors is an integer number (7809279).

Almost surely, 2^20824742 is an apocalyptic number.

20824742 is a deficient number, since it is larger than the sum of its proper divisors (10412374).

20824742 is a wasteful number, since it uses less digits than its factorization.

20824742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412373.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20824742 is about 4563.4134154161. The cubic root of 20824742 is about 275.1227749305.

The spelling of 20824742 in words is "twenty million, eight hundred twenty-four thousand, seven hundred forty-two".