20912029 has 2 divisors, whose sum is σ = 20912030. Its totient is φ = 20912028.

The previous prime is 20911963. The next prime is 20912041. The reversal of 20912029 is 92021902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 3523129 = 4170^2 + 1877^2 .

It is a cyclic number.

It is not a de Polignac number, because 20912029 - 2¹¹ = 20909981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20911994 and 20912012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20912069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456014 + 10456015.

It is an arithmetic number, because the mean of its divisors is an integer number (10456015).

Almost surely, 2^20912029 is an apocalyptic number.

It is an amenable number.

20912029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912029 is an equidigital number, since it uses as much as digits as its factorization.

20912029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20912029 is about 4572.9671986578. The cubic root of 20912029 is about 275.5066319002.

The spelling of 20912029 in words is "twenty million, nine hundred twelve thousand, twenty-nine".