20629171 has 2 divisors, whose sum is σ = 20629172. Its totient is φ = 20629170.

The previous prime is 20629157. The next prime is 20629201. The reversal of 20629171 is 17192602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20629171 - 2⁹ = 20628659 is a prime.

It is a super-2 number, since 2×20629171² = 851125392294482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20629111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314585 + 10314586.

It is an arithmetic number, because the mean of its divisors is an integer number (10314586).

Almost surely, 2^20629171 is an apocalyptic number.

20629171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629171 is an equidigital number, since it uses as much as digits as its factorization.

20629171 is an evil number, because the sum of its binary digits is even.

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

The square root of 20629171 is about 4541.9347199184. The cubic root of 20629171 is about 274.2588129438.

The spelling of 20629171 in words is "twenty million, six hundred twenty-nine thousand, one hundred seventy-one".