20021710 has 16 divisors (see below), whose sum is σ = 36534096. Its totient is φ = 7898688.

The previous prime is 20021693. The next prime is 20021711. The reversal of 20021710 is 1712002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021711) 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, 12984 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (2283381).

Almost surely, 2^20021710 is an apocalyptic number.

20021710 is a deficient number, since it is larger than the sum of its proper divisors (16512386).

20021710 is a wasteful number, since it uses less digits than its factorization.

20021710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27507.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 20021710 is about 4474.5625484510. The cubic root of 20021710 is about 271.5399428203.

Adding to 20021710 its reverse (1712002), we get a palindrome (21733712).

The spelling of 20021710 in words is "twenty million, twenty-one thousand, seven hundred ten".