20712449 has 2 divisors, whose sum is σ = 20712450. Its totient is φ = 20712448.

The previous prime is 20712437. The next prime is 20712469. The reversal of 20712449 is 94421702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11950849 + 8761600 = 3457^2 + 2960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20712449 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20712469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356224 + 10356225.

It is an arithmetic number, because the mean of its divisors is an integer number (10356225).

Almost surely, 2^20712449 is an apocalyptic number.

It is an amenable number.

20712449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712449 is an equidigital number, since it uses as much as digits as its factorization.

20712449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20712449 is about 4551.0931653835. The cubic root of 20712449 is about 274.6273696870.

The spelling of 20712449 in words is "twenty million, seven hundred twelve thousand, four hundred forty-nine".