20711629 has 2 divisors, whose sum is σ = 20711630. Its totient is φ = 20711628.

The previous prime is 20711617. The next prime is 20711641. The reversal of 20711629 is 92611702.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20711617) and next prime (20711641).

It can be written as a sum of positive squares in only one way, i.e., 19377604 + 1334025 = 4402^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 20711629 - 2²³ = 12323021 is a prime.

It is a super-3 number, since 3×20711629³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20711597 and 20711606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20711609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355814 + 10355815.

It is an arithmetic number, because the mean of its divisors is an integer number (10355815).

Almost surely, 2^20711629 is an apocalyptic number.

It is an amenable number.

20711629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20711629 is an equidigital number, since it uses as much as digits as its factorization.

20711629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 20711629 is about 4551.0030762459. The cubic root of 20711629 is about 274.6237454991.

Subtracting from 20711629 its sum of digits (28), we obtain a square (20711601 = 4551²).

The spelling of 20711629 in words is "twenty million, seven hundred eleven thousand, six hundred twenty-nine".