20026647 has 6 divisors (see below), whose sum is σ = 28927392. Its totient is φ = 13351092.

The previous prime is 20026639. The next prime is 20026673. The reversal of 20026647 is 74662002.

It is not a de Polignac number, because 20026647 - 2³ = 20026639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20026647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20026607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112583 + ... + 1112600.

It is an arithmetic number, because the mean of its divisors is an integer number (4821232).

Almost surely, 2^20026647 is an apocalyptic number.

20026647 is a deficient number, since it is larger than the sum of its proper divisors (8900745).

20026647 is a wasteful number, since it uses less digits than its factorization.

20026647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225189 (or 2225186 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20026647 is about 4475.1141884873. The cubic root of 20026647 is about 271.5622599704.

Adding to 20026647 its reverse (74662002), we get a palindrome (94688649).

It can be divided in two parts, 2002 and 6647, that added together give a square (8649 = 93²).

The spelling of 20026647 in words is "twenty million, twenty-six thousand, six hundred forty-seven".