20321151 has 16 divisors (see below), whose sum is σ = 28093440. Its totient is φ = 13052160.

The previous prime is 20321149. The next prime is 20321153. The reversal of 20321151 is 15112302.

It is an interprime number because it is at equal distance from previous prime (20321149) and next prime (20321153).

It is not a de Polignac number, because 20321151 - 2¹ = 20321149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20321151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32520 + ... + 33138.

It is an arithmetic number, because the mean of its divisors is an integer number (1755840).

Almost surely, 2^20321151 is an apocalyptic number.

20321151 is a deficient number, since it is larger than the sum of its proper divisors (7772289).

20321151 is a wasteful number, since it uses less digits than its factorization.

20321151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20321151 is about 4507.8987344438. The cubic root of 20321151 is about 272.8869502002.

Adding to 20321151 its reverse (15112302), we get a palindrome (35433453).

The spelling of 20321151 in words is "twenty million, three hundred twenty-one thousand, one hundred fifty-one".