20912151 has 16 divisors (see below), whose sum is σ = 30330720. Its totient is φ = 12739200.

The previous prime is 20912149. The next prime is 20912189. The reversal of 20912151 is 15121902.

It is not a de Polignac number, because 20912151 - 2¹ = 20912149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20912191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (1895670).

Almost surely, 2^20912151 is an apocalyptic number.

20912151 is a deficient number, since it is larger than the sum of its proper divisors (9418569).

20912151 is a wasteful number, since it uses less digits than its factorization.

20912151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 20912151 is about 4572.9805378987. The cubic root of 20912151 is about 275.5071676643.

The spelling of 20912151 in words is "twenty million, nine hundred twelve thousand, one hundred fifty-one".