20712577 has 2 divisors, whose sum is σ = 20712578. Its totient is φ = 20712576.

The previous prime is 20712553. The next prime is 20712589. The reversal of 20712577 is 77521702.

20712577 is nontrivially palindromic in base 5.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 5157441 = 3944^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712577 - 2⁷ = 20712449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20712547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356288 + 10356289.

It is an arithmetic number, because the mean of its divisors is an integer number (10356289).

Almost surely, 2^20712577 is an apocalyptic number.

It is an amenable number.

20712577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712577 is an equidigital number, since it uses as much as digits as its factorization.

20712577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 20712577 is about 4551.1072279172. The cubic root of 20712577 is about 274.6279354052.

The spelling of 20712577 in words is "twenty million, seven hundred twelve thousand, five hundred seventy-seven".