20934149 has 4 divisors (see below), whose sum is σ = 21444780. Its totient is φ = 20423520.

The previous prime is 20934139. The next prime is 20934197. The reversal of 20934149 is 94143902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94143902 = 2 ⋅47071951.

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 14303524 = 2575^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 20934149 - 2⁸ = 20933893 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 (20934139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255254 + ... + 255335.

It is an arithmetic number, because the mean of its divisors is an integer number (5361195).

Almost surely, 2^20934149 is an apocalyptic number.

It is an amenable number.

20934149 is a deficient number, since it is larger than the sum of its proper divisors (510631).

20934149 is an equidigital number, since it uses as much as digits as its factorization.

20934149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510630.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20934149 is about 4575.3851204024. The cubic root of 20934149 is about 275.6037380397.

The spelling of 20934149 in words is "twenty million, nine hundred thirty-four thousand, one hundred forty-nine".