20615151 has 4 divisors (see below), whose sum is σ = 27486872. Its totient is φ = 13743432.

The previous prime is 20615149. The next prime is 20615167. The reversal of 20615151 is 15151602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20615151 - 2¹ = 20615149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3435856 + ... + 3435861.

It is an arithmetic number, because the mean of its divisors is an integer number (6871718).

Almost surely, 2^20615151 is an apocalyptic number.

20615151 is a deficient number, since it is larger than the sum of its proper divisors (6871721).

20615151 is an equidigital number, since it uses as much as digits as its factorization.

20615151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871720.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 20615151 is about 4540.3910624527. The cubic root of 20615151 is about 274.1966682595.

Adding to 20615151 its reverse (15151602), we get a palindrome (35766753).

The spelling of 20615151 in words is "twenty million, six hundred fifteen thousand, one hundred fifty-one".