20946151 has 4 divisors (see below), whose sum is σ = 22048600. Its totient is φ = 19843704.

The previous prime is 20946131. The next prime is 20946157. The reversal of 20946151 is 15164902.

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

It is a cyclic number.

It is not a de Polignac number, because 20946151 - 2¹⁷ = 20815079 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 (20946157) 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, 551196 + ... + 551233.

It is an arithmetic number, because the mean of its divisors is an integer number (5512150).

Almost surely, 2^20946151 is an apocalyptic number.

20946151 is a deficient number, since it is larger than the sum of its proper divisors (1102449).

20946151 is a wasteful number, since it uses less digits than its factorization.

20946151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102448.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20946151 is about 4576.6965160474. The cubic root of 20946151 is about 275.6563978369.

It can be divided in two parts, 209 and 46151, that added together give a triangular number (46360 = T₃₀₄).

The spelling of 20946151 in words is "twenty million, nine hundred forty-six thousand, one hundred fifty-one".