20842246 has 4 divisors (see below), whose sum is σ = 31263372. Its totient is φ = 10421122.

The previous prime is 20842243. The next prime is 20842247. The reversal of 20842246 is 64224802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64224802 = 2 ⋅32112401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842243) by changing a digit.

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, 5210560 + ... + 5210563.

It is an arithmetic number, because the mean of its divisors is an integer number (7815843).

Almost surely, 2^20842246 is an apocalyptic number.

20842246 is a deficient number, since it is larger than the sum of its proper divisors (10421126).

20842246 is a wasteful number, since it uses less digits than its factorization.

20842246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10421125.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20842246 is about 4565.3308751940. The cubic root of 20842246 is about 275.1998371163.

The spelling of 20842246 in words is "twenty million, eight hundred forty-two thousand, two hundred forty-six".