20720254 has 4 divisors (see below), whose sum is σ = 31080384. Its totient is φ = 10360126.

The previous prime is 20720237. The next prime is 20720261. The reversal of 20720254 is 45202702.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5180062 + ... + 5180065.

It is an arithmetic number, because the mean of its divisors is an integer number (7770096).

Almost surely, 2^20720254 is an apocalyptic number.

20720254 is a deficient number, since it is larger than the sum of its proper divisors (10360130).

20720254 is a wasteful number, since it uses less digits than its factorization.

20720254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10360129.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20720254 is about 4551.9505709091. The cubic root of 20720254 is about 274.6618609799.

Adding to 20720254 its reverse (45202702), we get a palindrome (65922956).

The spelling of 20720254 in words is "twenty million, seven hundred twenty thousand, two hundred fifty-four".