20630771 has 8 divisors (see below), whose sum is σ = 23877120. Its totient is φ = 17459208.

The previous prime is 20630767. The next prime is 20630773. The reversal of 20630771 is 17703602.

20630771 = 169² + 170² + ... + 405².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20630771 - 2² = 20630767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20630771.

It is not an unprimeable number, because it can be changed into a prime (20630773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18101 + ... + 19206.

It is an arithmetic number, because the mean of its divisors is an integer number (2984640).

Almost surely, 2^20630771 is an apocalyptic number.

20630771 is a deficient number, since it is larger than the sum of its proper divisors (3246349).

20630771 is an equidigital number, since it uses as much as digits as its factorization.

20630771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37393.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20630771 is about 4542.1108528965. The cubic root of 20630771 is about 274.2659032716.

The spelling of 20630771 in words is "twenty million, six hundred thirty thousand, seven hundred seventy-one".