20720046 has 8 divisors (see below), whose sum is σ = 41440104. Its totient is φ = 6906680.

The previous prime is 20720039. The next prime is 20720057. The reversal of 20720046 is 64002702.

It is a happy number.

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

20720046 is an admirable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1726665 + ... + 1726676.

It is an arithmetic number, because the mean of its divisors is an integer number (5180013).

Almost surely, 2^20720046 is an apocalyptic number.

20720046 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20720046 is a wasteful number, since it uses less digits than its factorization.

20720046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453346.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20720046 is about 4551.9277235035. The cubic root of 20720046 is about 274.6609419137.

Adding to 20720046 its reverse (64002702), we get a palindrome (84722748).

The spelling of 20720046 in words is "twenty million, seven hundred twenty thousand, forty-six".