20629513 has 2 divisors, whose sum is σ = 20629514. Its totient is φ = 20629512.

The previous prime is 20629489. The next prime is 20629523. The reversal of 20629513 is 31592602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12027024 + 8602489 = 3468^2 + 2933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20629513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20629523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314756 + 10314757.

It is an arithmetic number, because the mean of its divisors is an integer number (10314757).

Almost surely, 2^20629513 is an apocalyptic number.

It is an amenable number.

20629513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629513 is an equidigital number, since it uses as much as digits as its factorization.

20629513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20629513 is about 4541.9723689164. The cubic root of 20629513 is about 274.2603285322.

The spelling of 20629513 in words is "twenty million, six hundred twenty-nine thousand, five hundred thirteen".