20720234 has 8 divisors (see below), whose sum is σ = 31271520. Its totient is φ = 10296396.

The previous prime is 20720221. The next prime is 20720237. The reversal of 20720234 is 43202702.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20720237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31454 + ... + 32105.

It is an arithmetic number, because the mean of its divisors is an integer number (3908940).

Almost surely, 2^20720234 is an apocalyptic number.

20720234 is a deficient number, since it is larger than the sum of its proper divisors (10551286).

20720234 is a wasteful number, since it uses less digits than its factorization.

20720234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63724.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20720234 is about 4551.9483740482. The cubic root of 20720234 is about 274.6617726084.

Adding to 20720234 its reverse (43202702), we get a palindrome (63922936).

The spelling of 20720234 in words is "twenty million, seven hundred twenty thousand, two hundred thirty-four".