20440151 has 2 divisors, whose sum is σ = 20440152. Its totient is φ = 20440150.

The previous prime is 20440111. The next prime is 20440153. The reversal of 20440151 is 15104402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20440151 is a prime.

Together with 20440153, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440153) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220075 + 10220076.

It is an arithmetic number, because the mean of its divisors is an integer number (10220076).

Almost surely, 2^20440151 is an apocalyptic number.

20440151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440151 is an equidigital number, since it uses as much as digits as its factorization.

20440151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20440151 is about 4521.0785217689. The cubic root of 20440151 is about 273.4185861704.

Adding to 20440151 its reverse (15104402), we get a palindrome (35544553).

The spelling of 20440151 in words is "twenty million, four hundred forty thousand, one hundred fifty-one".