20663310 has 16 divisors (see below), whose sum is σ = 49592016. Its totient is φ = 5510208.

The previous prime is 20663309. The next prime is 20663327. The reversal of 20663310 is 1336602.

It is a super-2 number, since 2×20663310² = 853944760312200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344359 + ... + 344418.

It is an arithmetic number, because the mean of its divisors is an integer number (3099501).

Almost surely, 2^20663310 is an apocalyptic number.

20663310 is an abundant number, since it is smaller than the sum of its proper divisors (28928706).

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

20663310 is a wasteful number, since it uses less digits than its factorization.

20663310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688787.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20663310 is about 4545.6913665580. The cubic root of 20663310 is about 274.4100189147.

Adding to 20663310 its reverse (1336602), we get a palindrome (21999912).

The spelling of 20663310 in words is "twenty million, six hundred sixty-three thousand, three hundred ten".