20663530 has 16 divisors (see below), whose sum is σ = 37294344. Its totient is φ = 8243200.

The previous prime is 20663509. The next prime is 20663543. The reversal of 20663530 is 3536602.

It can be written as a sum of positive squares in 4 ways, for example, as 20602521 + 61009 = 4539^2 + 247^2 .

It is a super-3 number, since 3×20663530³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20663495 and 20663504.

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, 1434 + ... + 6586.

Almost surely, 2^20663530 is an apocalyptic number.

20663530 is a deficient number, since it is larger than the sum of its proper divisors (16630814).

20663530 is a wasteful number, since it uses less digits than its factorization.

20663530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 20663530 is about 4545.7155652328. The cubic root of 20663530 is about 274.4109927824.

It can be divided in two parts, 206 and 63530, that added together give a palindrome (63736).

The spelling of 20663530 in words is "twenty million, six hundred sixty-three thousand, five hundred thirty".