20916149 has 8 divisors (see below), whose sum is σ = 21373440. Its totient is φ = 20462400.

The previous prime is 20916143. The next prime is 20916151. The reversal of 20916149 is 94161902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20916149 - 2¹² = 20912053 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 (20916143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13484 + ... + 14954.

It is an arithmetic number, because the mean of its divisors is an integer number (2671680).

Almost surely, 2^20916149 is an apocalyptic number.

It is an amenable number.

20916149 is a deficient number, since it is larger than the sum of its proper divisors (457291).

20916149 is a wasteful number, since it uses less digits than its factorization.

20916149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20916149 is about 4573.4176498544. The cubic root of 20916149 is about 275.5247237647.

The spelling of 20916149 in words is "twenty million, nine hundred sixteen thousand, one hundred forty-nine".