20640151 has 8 divisors (see below), whose sum is σ = 23617440. Its totient is φ = 17670048.

The previous prime is 20640149. The next prime is 20640157. The reversal of 20640151 is 15104602.

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 20640151 - 2¹ = 20640149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7785 + ... + 10093.

It is an arithmetic number, because the mean of its divisors is an integer number (2952180).

Almost surely, 2^20640151 is an apocalyptic number.

20640151 is a deficient number, since it is larger than the sum of its proper divisors (2977289).

20640151 is a wasteful number, since it uses less digits than its factorization.

20640151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20640151 is about 4543.1432951207. The cubic root of 20640151 is about 274.3074629461.

Adding to 20640151 its reverse (15104602), we get a palindrome (35744753).

The spelling of 20640151 in words is "twenty million, six hundred forty thousand, one hundred fifty-one".