20554247 has 8 divisors (see below), whose sum is σ = 23663136. Its totient is φ = 17488512.

The previous prime is 20554229. The next prime is 20554253. The reversal of 20554247 is 74245502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20554247 - 2²⁰ = 19505671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554217) 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 in 7 ways as a sum of consecutive naturals, for example, 9758 + ... + 11675.

It is an arithmetic number, because the mean of its divisors is an integer number (2957892).

Almost surely, 2^20554247 is an apocalyptic number.

20554247 is a deficient number, since it is larger than the sum of its proper divisors (3108889).

20554247 is a wasteful number, since it uses less digits than its factorization.

20554247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21577.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20554247 is about 4533.6791902383. The cubic root of 20554247 is about 273.9263792475.

Adding to 20554247 its reverse (74245502), we get a palindrome (94799749).

The spelling of 20554247 in words is "twenty million, five hundred fifty-four thousand, two hundred forty-seven".