20629871 has 4 divisors (see below), whose sum is σ = 20780592. Its totient is φ = 20479152.

The previous prime is 20629867. The next prime is 20629883. The reversal of 20629871 is 17892602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20629871 - 2² = 20629867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20629171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75155 + ... + 75428.

It is an arithmetic number, because the mean of its divisors is an integer number (5195148).

Almost surely, 2^20629871 is an apocalyptic number.

20629871 is a deficient number, since it is larger than the sum of its proper divisors (150721).

20629871 is a wasteful number, since it uses less digits than its factorization.

20629871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150720.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20629871 is about 4542.0117789367. The cubic root of 20629871 is about 274.2619150073.

The spelling of 20629871 in words is "twenty million, six hundred twenty-nine thousand, eight hundred seventy-one".