20663430 has 32 divisors (see below), whose sum is σ = 51750144. Its totient is φ = 5270496.

The previous prime is 20663417. The next prime is 20663437. The reversal of 20663430 is 3436602.

It is a self number, because there is not a number n which added to its sum of digits gives 20663430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14284 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (1617192).

Almost surely, 2^20663430 is an apocalyptic number.

20663430 is an abundant number, since it is smaller than the sum of its proper divisors (31086714).

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

20663430 is a wasteful number, since it uses less digits than its factorization.

20663430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29980.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 20663430 is about 4545.7045658512. The cubic root of 20663430 is about 274.4105501161.

It can be divided in two parts, 206 and 63430, that added together give a palindrome (63636).

The spelling of 20663430 in words is "twenty million, six hundred sixty-three thousand, four hundred thirty".