20021734 has 8 divisors (see below), whose sum is σ = 30081240. Its totient is φ = 9994656.

The previous prime is 20021731. The next prime is 20021737. The reversal of 20021734 is 43712002.

It is an interprime number because it is at equal distance from previous prime (20021731) and next prime (20021737).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021731) 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 3 ways as a sum of consecutive naturals, for example, 6499 + ... + 9070.

It is an arithmetic number, because the mean of its divisors is an integer number (3760155).

Almost surely, 2^20021734 is an apocalyptic number.

20021734 is a deficient number, since it is larger than the sum of its proper divisors (10059506).

20021734 is a wasteful number, since it uses less digits than its factorization.

20021734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16214.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20021734 is about 4474.5652302766. The cubic root of 20021734 is about 271.5400513184.

Adding to 20021734 its reverse (43712002), we get a palindrome (63733736).

The spelling of 20021734 in words is "twenty million, twenty-one thousand, seven hundred thirty-four".