20979029 has 2 divisors, whose sum is σ = 20979030. Its totient is φ = 20979028.

The previous prime is 20979019. The next prime is 20979047. The reversal of 20979029 is 92097902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 1416100 = 4423^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20979029 - 2⁸ = 20978773 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20978983 and 20979001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20979019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489514 + 10489515.

It is an arithmetic number, because the mean of its divisors is an integer number (10489515).

Almost surely, 2^20979029 is an apocalyptic number.

It is an amenable number.

20979029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979029 is an equidigital number, since it uses as much as digits as its factorization.

20979029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 20979029 is about 4580.2869997414. The cubic root of 20979029 is about 275.8005499099.

The spelling of 20979029 in words is "twenty million, nine hundred seventy-nine thousand, twenty-nine".