20929297 has 2 divisors, whose sum is σ = 20929298. Its totient is φ = 20929296.

The previous prime is 20929273. The next prime is 20929331. The reversal of 20929297 is 79292902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 1002001 = 4464^2 + 1001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20929297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20929267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10464648 + 10464649.

It is an arithmetic number, because the mean of its divisors is an integer number (10464649).

Almost surely, 2^20929297 is an apocalyptic number.

It is an amenable number.

20929297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20929297 is an equidigital number, since it uses as much as digits as its factorization.

20929297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20929297 is about 4574.8548610858. The cubic root of 20929297 is about 275.5824437633.

The spelling of 20929297 in words is "twenty million, nine hundred twenty-nine thousand, two hundred ninety-seven".