20630660 has 12 divisors (see below), whose sum is σ = 43324428. Its totient is φ = 8252256.

The previous prime is 20630647. The next prime is 20630681. The reversal of 20630660 is 6603602.

It can be written as a sum of positive squares in 2 ways, for example, as 3474496 + 17156164 = 1864^2 + 4142^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 515747 + ... + 515786.

It is an arithmetic number, because the mean of its divisors is an integer number (3610369).

Almost surely, 2^20630660 is an apocalyptic number.

20630660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20630660 is an abundant number, since it is smaller than the sum of its proper divisors (22693768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20630660 is a wasteful number, since it uses less digits than its factorization.

20630660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031542 (or 1031540 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20630660 is about 4542.0986338916. The cubic root of 20630660 is about 274.2654113920.

The spelling of 20630660 in words is "twenty million, six hundred thirty thousand, six hundred sixty".