20720054 has 4 divisors (see below), whose sum is σ = 31080084. Its totient is φ = 10360026.

The previous prime is 20720039. The next prime is 20720057. The reversal of 20720054 is 45002702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720057) by changing a digit.

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, 5180012 + ... + 5180015.

It is an arithmetic number, because the mean of its divisors is an integer number (7770021).

Almost surely, 2^20720054 is an apocalyptic number.

20720054 is a deficient number, since it is larger than the sum of its proper divisors (10360030).

20720054 is a wasteful number, since it uses less digits than its factorization.

20720054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10360029.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20720054 is about 4551.9286022520. The cubic root of 20720054 is about 274.6609772625.

Adding to 20720054 its reverse (45002702), we get a palindrome (65722756).

The spelling of 20720054 in words is "twenty million, seven hundred twenty thousand, fifty-four".