20113949 has 2 divisors, whose sum is σ = 20113950. Its totient is φ = 20113948.

The previous prime is 20113927. The next prime is 20113963. The reversal of 20113949 is 94931102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 912025 = 4382^2 + 955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20113949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20113999) 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 as a sum of consecutive naturals, namely, 10056974 + 10056975.

It is an arithmetic number, because the mean of its divisors is an integer number (10056975).

Almost surely, 2^20113949 is an apocalyptic number.

It is an amenable number.

20113949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113949 is an equidigital number, since it uses as much as digits as its factorization.

20113949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20113949 is about 4484.8577457931. The cubic root of 20113949 is about 271.9562943401.

The spelling of 20113949 in words is "twenty million, one hundred thirteen thousand, nine hundred forty-nine".