20999151 has 6 divisors (see below), whose sum is σ = 30332120. Its totient is φ = 13999428.

The previous prime is 20999149. The next prime is 20999159. The reversal of 20999151 is 15199902.

It is not a de Polignac number, because 20999151 - 2¹ = 20999149 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 (20999159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1166611 + ... + 1166628.

Almost surely, 2^20999151 is an apocalyptic number.

20999151 is a deficient number, since it is larger than the sum of its proper divisors (9332969).

20999151 is a wasteful number, since it uses less digits than its factorization.

20999151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333245 (or 2333242 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 20999151 is about 4582.4830605252. The cubic root of 20999151 is about 275.8886996092. Note that the first 3 decimals are identical.

The spelling of 20999151 in words is "twenty million, nine hundred ninety-nine thousand, one hundred fifty-one".